Everyone knows that in times past, Sony has had the opportunity to jump on certain titles and keep them exclusive for the PlayStation 3 system. Whether it was communicating with developers or supplying development kits, major titles wouldn't have slipped into multiplatform grounds.
The following list are all games that were once announced as exclusives to the PlayStation 3. However due to lack of development kits, funds, or simply publishers changing their minds, Sony lost exclusivity.
Also included is a list of major titles that could have been co-releases if Sony would have pushed out their development kits sooner and perhaps ponied up some money. However since they didn't, these are all titles Microsoft has gladly taken in as timed exclusives on the Xbox 360.