Just looking at the list so far there are a few big names (for a released list anyway) and a few that might raise an eyebrow.
From Chelsea thaer is joe Cole and Michael Ballack. Maybe an indication that the blues are no longer prepared to pay anyone anything. Cole's wage demands no doubt would have influenced Chelsea's decision to let him go (not negotiate further to keep him). Fabio aurelio from Liverpool is another that stands out.
Then there are those who once showed potential but never really realised it. Marlon Harewood from Villa, Martin Petrov from City, Admy Faye from Stoke and Jonathan Greening from WBA (wasn't he on loan at Fulham last year on a year long deal) for instance.
Finally there are those who have been decent players for their clubs, good solid players that were never "stars", and time has just caught up with them. Andy Marshall (Villa), Lee Carsley, Gary McSheffery (Birimingham), Steven Reid (b4st4rds) stand out for me