Here are some results from the past:
2004:
1 Lance Armstrong (USA) US Postal p/b Berry Floor 1.06.49 (49.39 km/h)
2 Jan Ullrich (Ger) T-Mobile Team 1.01
3 Andreas Klöden (Ger) T-Mobile Team 1.27
4 Floyd Landis (USA) US Postal p/b Berry Floor 2.25
5 Bobby Julich (USA) Team CSC 2.48
6 Ivan Basso (Ita) Team CSC 2.50
7 Jens Voigt (Ger) Team CSC 3.19
8 Vladimir Karpets (Rus) Illes Balears - Banesto 3.33
9 Jose Luis Rubiera (Spa) US Postal p/b Berry Floor 3.40
10 Jose Azevedo (Por) US Postal p/b Berry Floor 3.49
11 George Hincapie (USA) US Postal p/b Berry Floor 3.56
12 Levi Leipheimer (USA) Rabobank 4.06
13 Santos Gonzalez (Spa) Phonak Hearing Systems 4.17
14 Aitor Gonzalez Jimenez (Spa) Fassa Bortolo 4.33
15 José I.Gutierrez Palacios (Spa) Illes Balears - Banesto 4.53
16 Viatcheslav Ekimov (Rus) US Postal p/b Berry Floor 4.54
17 Carlos Sastre (Spa) Team CSC 4.56
2005:
1 Lance Armstrong (USA) Discovery Channel 1.11.46 (46.4 km/h)
2 Jan Ullrich (Ger) T-Mobile Team 0.23
3 Alexandre Vinokourov (Kaz) T-Mobile Team 1.16
4 Bobby Julich (USA) Team CSC 1.33
5 Ivan Basso (Ita) Team CSC 1.54
6 Floyd Landis (USA) Phonak Hearing Systems 2.02
7 Cadel Evans (Aus) Davitamon-Lotto 2.06
8 George Hincapie (USA) Discovery Channel 2.25
9 Francisco Mancebo (Spa) Illes Balears-Caisse d'Epargne 2.51
10 Vladimir Karpets (Rus) Illes Balears-Caisse d'Epargne 3.05
11 Yaroslav Popovych (Ukr) Discovery Channel 3.09
12 Carlos Sastre (Spa) Team CSC 3.10
13 Christophe Moreau (Fra) Credit Agricole 3.11
14 Levi Leipheimer (USA) Gerolsteiner 3.13
15 Oscar Pereiro Sio (Spa) Phonak Hearing Systems 3.25
I mean, look at those gaps.
However, here are the 2002 Ventoux results:
1 Richard Virenque (Fra) Domo-Farm Frites 5.43.26 (38.61 km/h)
2 Alexandre Botcharov (Rus) Ag2R Prevoyance 1.58
3 Lance Armstrong (USA) US Postal Service 2.20
4 Marco Serpellini (Ita) Lampre Daikin 2.54
5 Raimondas Rumsas (Ltu) Lampre Daikin 3.36
6 Ivan Basso (Ita) Fassa Bortolo 3.39
7 Francisco Mancebo (Spa) iBanesto.com 3.51
8 Joseba Beloki (Spa) ONCE-Eroski 4.05
9 Dariusz Baranowski (Pol) iBanesto.com 4.10
10 Ivan Gotti (Ita) Alessio 4.16
11 Levi Leipheimer (USA) Rabobank 4.25
12 José Azevedo (Por) ONCE-Eroski 4.45
13 Stephane Goubert (Fra) Jean Delatour 5.25
14 David Moncoutié (Fra) Cofidis 5.46
15 Roberto Heras Hernandez (Spa) US Postal Service
16 Oscar Sevilla (Spa) Kelme-Costa Blanca 5.52
17 Cristian Moreni (Ita) Alessio 5.57
18 Jean-Cyril Robin (Fra) FDJeux.com 7.07
19 Tyler Hamilton (USA) CSC-Tiscali
20 Mikel Pradera (Spa) ONCE-Eroski 7.29
21 Igor Gonzalez de Galdeano (Spa) ONCE-Eroski
22 Roberto Laiseka (Spa) Euskaltel-Euskadi
23 Michael Boogerd (Ned) Rabobank 7.47
24 Massimiliano Lelli (Ita) Cofidis 7.57
25 Andrei Kivilev (Kaz) Cofidis 8.01
26 Unai Osa (Spa) iBanesto.com 8.14
27 Wladimir Belli (Ita) Fassa Bortolo 8.14
28 José Luis Rubiera Vigil (Spa) US Postal Service 8.30
29 Carlos Sastre (Spa) CSC-Tiscali 8.37
Two important considerations:
1) the ITT results above are from 55km ITTs, and this year it's only 40km
2) The first 2 riders on Ventoux were in an "allowed" break. As such, the 10th guy after Armstrong lost 3 minutes on Ventoux, while the 10th guy in each of the 55k ITTs lost a little over 3 minutes.
3) The vast majority of riders got a distinctive time on Ventoux, indicating they ended up almost all separating from each other.
So, we should expect significant gaps in both stages, but perhaps a bit more from Ventoux than from the ITT.
2004:
1 Lance Armstrong (USA) US Postal p/b Berry Floor 1.06.49 (49.39 km/h)
2 Jan Ullrich (Ger) T-Mobile Team 1.01
3 Andreas Klöden (Ger) T-Mobile Team 1.27
4 Floyd Landis (USA) US Postal p/b Berry Floor 2.25
5 Bobby Julich (USA) Team CSC 2.48
6 Ivan Basso (Ita) Team CSC 2.50
7 Jens Voigt (Ger) Team CSC 3.19
8 Vladimir Karpets (Rus) Illes Balears - Banesto 3.33
9 Jose Luis Rubiera (Spa) US Postal p/b Berry Floor 3.40
10 Jose Azevedo (Por) US Postal p/b Berry Floor 3.49
11 George Hincapie (USA) US Postal p/b Berry Floor 3.56
12 Levi Leipheimer (USA) Rabobank 4.06
13 Santos Gonzalez (Spa) Phonak Hearing Systems 4.17
14 Aitor Gonzalez Jimenez (Spa) Fassa Bortolo 4.33
15 José I.Gutierrez Palacios (Spa) Illes Balears - Banesto 4.53
16 Viatcheslav Ekimov (Rus) US Postal p/b Berry Floor 4.54
17 Carlos Sastre (Spa) Team CSC 4.56
2005:
1 Lance Armstrong (USA) Discovery Channel 1.11.46 (46.4 km/h)
2 Jan Ullrich (Ger) T-Mobile Team 0.23
3 Alexandre Vinokourov (Kaz) T-Mobile Team 1.16
4 Bobby Julich (USA) Team CSC 1.33
5 Ivan Basso (Ita) Team CSC 1.54
6 Floyd Landis (USA) Phonak Hearing Systems 2.02
7 Cadel Evans (Aus) Davitamon-Lotto 2.06
8 George Hincapie (USA) Discovery Channel 2.25
9 Francisco Mancebo (Spa) Illes Balears-Caisse d'Epargne 2.51
10 Vladimir Karpets (Rus) Illes Balears-Caisse d'Epargne 3.05
11 Yaroslav Popovych (Ukr) Discovery Channel 3.09
12 Carlos Sastre (Spa) Team CSC 3.10
13 Christophe Moreau (Fra) Credit Agricole 3.11
14 Levi Leipheimer (USA) Gerolsteiner 3.13
15 Oscar Pereiro Sio (Spa) Phonak Hearing Systems 3.25
I mean, look at those gaps.
However, here are the 2002 Ventoux results:
1 Richard Virenque (Fra) Domo-Farm Frites 5.43.26 (38.61 km/h)
2 Alexandre Botcharov (Rus) Ag2R Prevoyance 1.58
3 Lance Armstrong (USA) US Postal Service 2.20
4 Marco Serpellini (Ita) Lampre Daikin 2.54
5 Raimondas Rumsas (Ltu) Lampre Daikin 3.36
6 Ivan Basso (Ita) Fassa Bortolo 3.39
7 Francisco Mancebo (Spa) iBanesto.com 3.51
8 Joseba Beloki (Spa) ONCE-Eroski 4.05
9 Dariusz Baranowski (Pol) iBanesto.com 4.10
10 Ivan Gotti (Ita) Alessio 4.16
11 Levi Leipheimer (USA) Rabobank 4.25
12 José Azevedo (Por) ONCE-Eroski 4.45
13 Stephane Goubert (Fra) Jean Delatour 5.25
14 David Moncoutié (Fra) Cofidis 5.46
15 Roberto Heras Hernandez (Spa) US Postal Service
16 Oscar Sevilla (Spa) Kelme-Costa Blanca 5.52
17 Cristian Moreni (Ita) Alessio 5.57
18 Jean-Cyril Robin (Fra) FDJeux.com 7.07
19 Tyler Hamilton (USA) CSC-Tiscali
20 Mikel Pradera (Spa) ONCE-Eroski 7.29
21 Igor Gonzalez de Galdeano (Spa) ONCE-Eroski
22 Roberto Laiseka (Spa) Euskaltel-Euskadi
23 Michael Boogerd (Ned) Rabobank 7.47
24 Massimiliano Lelli (Ita) Cofidis 7.57
25 Andrei Kivilev (Kaz) Cofidis 8.01
26 Unai Osa (Spa) iBanesto.com 8.14
27 Wladimir Belli (Ita) Fassa Bortolo 8.14
28 José Luis Rubiera Vigil (Spa) US Postal Service 8.30
29 Carlos Sastre (Spa) CSC-Tiscali 8.37
Two important considerations:
1) the ITT results above are from 55km ITTs, and this year it's only 40km
2) The first 2 riders on Ventoux were in an "allowed" break. As such, the 10th guy after Armstrong lost 3 minutes on Ventoux, while the 10th guy in each of the 55k ITTs lost a little over 3 minutes.
3) The vast majority of riders got a distinctive time on Ventoux, indicating they ended up almost all separating from each other.
So, we should expect significant gaps in both stages, but perhaps a bit more from Ventoux than from the ITT.