Can't believe I started this thread back in 2006. Seem to be an explosion of remakes everywhere at the moment for iOS/Android. Seem to be getting thin on the ground with remakes for PC lately probably because there's not many left to remake looking at the many retroremakes websites out there. lol
I had played Giana Sisters: Twisted Dreams a few months back. Although I wouldn't strictly call it a remake - more of a sequel as apart from the usual collecting gems and platform element, it's certainly a beautiful game to look at and play. And damn hard in places lol.
Another classic game I loved was Spindizzy Worlds. A remake was in progress but seem to had stalled. Looked promising too....