Those slackers at iFixit really know how get into a MacBook quick. Here's their takeapart of the new 13-inch MacBook Pro. Note that it is fairly simple to replace the hard drive and RAM. Unscrew the bottom lid and you are presented with all of the good stuff right away. The RAM slides out, while the hard drive is four more screws away.
Speaking of which, here's a 5400 RPM500GB Hitachi drive for $89. Dayum.
Or a