To be honest, I'm not sure! I'm a Windows user and will be trying out OS X, ideally with the move to migrate to using it most of the time. I'll be doing standard things like word processing and watching the odd movie, but might also dabble in the iPhone development app if I get a chance.
That said, Windows is still definitely where my 15 years experience is (I'm 29) so any recommendations based on the above would be appreciated.
In light of this, maybe partition most of the drive to Windows and leave about 40gb for OS X until I'm a more competent user?