iBlast Moki. PS: You should just check Camzy's thread with votes for best game genres, they've already done physics games. But iBlast Moki is seriously a must have.
iBlast Moki, iDrop Dead, Moonlights, Finger Physics, Smashed, Fantastic Contraption, Twilight Golf, Melon Golf, Perfect Balance ( All Three of them )
Jet Car Stunts! i blast moki is.. more of a puzzle using gravity than a real display of physics capabilities
It is unpopular to mention... for some reason... but Enigmo is great. iBlast Moki is alot of fun but I'm not sure it is a pure "physics" game... but I prefer Enigmo.
Terrific, another dev. trying to get people's opinions. Why don't you just say you are a dev.? Normally a newbie to TA would check the other threads before asking a question like this.