Got back a short time ago from the Apple Store with my shiny new MacBook ($1299).
So I'm halfway through disassembling it to put in a 100GB 7200RPM hard drive when I could tell
the hard drive slides right out through the battery compartment!

The drive is plainly visible when you remove the battery. I saw it initially, but though no way you'd be able to just slide the thing right out, so I didn't even try. LOL So don't get a hard drive upgrade from Apple, folks! Upgrading the hard drive is a piece of cake,
even easier than installing the memory! I picked up my 100GB 7200rpm SATA from buy.com for $180 shipped a couple weeks back (Hitachi).
Since I had removed so many screws, I was able to lift the keyboard part way up to peek in at the processor, and it appears to be soldered to the main board. I didn't see any socket. Too bad.
I'd post picts, but I forgot my digital camera. I'll see if someone around here has one I can borrow.