This brings back memories. The most recently entry on the list is Skype, which is clearly too early to tell. This list has no entries between 2000 and 2005, when eBay got Skype. Were buyers that restrained during those days?
What about making a list of the worst startup acquisitions ever? The criteria are(a) exit priced at a significant premium to market, (b) business tanking post acquisition and (c) most of the good people fleeing. Send me your favorites.