All of KITT's transformations from the short-lived 2008-9 TV series. Shame it was cancelled; it was silly and campy, but a lot of fun!
I personally think that part of the reason it didn't catch on was that KITT's 'attack mode' looked fairly ridiculous, and lacked the "I want to drive that car" factor that the original Trans-Am KITT - and the normal Shelby Mustang of the new series - possessed. If it had looked more like a supercar than an 8-year-old's idea of a hot rod, maybe the show would have lasted longer. But who knows?