Here's a few more names to add to the mix, may have been mentioned already as players who flopped in the PL...
Steve Marlet - Lyon to Fulham for 11.5m in 2001
Shevchenko - Milan to Chelsea for 30.8m in 2006
Fran Jeffers - Bitters to Arsenal for 8m in 2001
Boulahrouz - Hamburg to Chelsea for 7m in 2006
Boumsong - Rangers to Newcastle for 8m in 2005