Here's a rundown of what I've upgraded:
6GB RAM (4GB + 2GB modules)
OCZ 60GB SSD
Hitachi 500GB 7200RPM HD
|Optical drive on the left, and OptiBay on the right.|
I divided my 500GB drive into two partitions. The first is a 60GB partition dedicated to Time Machine to act as my system backup. The second partition is a 440 GB storage disk, where I can store my media and larger files.
Okay, so I didn't really upgrade all that much, but it's a laptop.
I still like this old machine, for a variety of reasons (although those reasons will soon diminish once the Thunderbolt hardware starts to hit the shelves). The primary perk of my 15" Non-Unibody Macbook Pro is the extremely useful ExpressCard slot on the side. With it, I can add two eSata ports, or connect SxS cards directly into my laptop, both of which are very useful for on-set data management.