Since UCI ProTour was established in 2005, following teams from that level have disbanded:
Credit Agricole
Discovery Channel - even if they won TdF in 2007. Many of the key personnel joined Astana.
Domina Vacanze - Sponsor change, effectively Team Milram took that spot
Fassa Bortolo - no sponsor, Petacchi's team so kind of same story as with HTC-Highroad now.
Gerolsteiner - Schumacher and Kohl being tested positive certainly affected that, many riders joined Milram afterwards.
Liberty Seguros - Operacion Puerto, basically replaced by Astana.
Phonak - Had new sponsor who withdrew after Landis being tested positive
Team Milram
Unibet.com - victim of fight between organizers and UCI, couldn't tide any Grand Tour that year even if they had the license.
Credit Agricole
Discovery Channel - even if they won TdF in 2007. Many of the key personnel joined Astana.
Domina Vacanze - Sponsor change, effectively Team Milram took that spot
Fassa Bortolo - no sponsor, Petacchi's team so kind of same story as with HTC-Highroad now.
Gerolsteiner - Schumacher and Kohl being tested positive certainly affected that, many riders joined Milram afterwards.
Liberty Seguros - Operacion Puerto, basically replaced by Astana.
Phonak - Had new sponsor who withdrew after Landis being tested positive
Team Milram
Unibet.com - victim of fight between organizers and UCI, couldn't tide any Grand Tour that year even if they had the license.