SSD in Macbook Pro
I recently installed an SSD in my non-unibody (June 2008) 15" Macbook Pro.
Getting to the hard drive is a little tricky - it requires both a small jewelers and a torx 6 screwdriver. There are plenty of videos and guides on the net to help you out if you've not dismantled your MBP before. Keep in mind that swapping the drive yourself WILL void whatever remains of your warranty.
I installed an 80gb Intel X25-M and am really happy with the results - apps open MUCH faster and OSX boots much quicker than with the original 200gb/5,400rpm offering from Apple/Hitachi. The battery also seems to last longer, but I've not actually timed anything!
The only real limitation is that the drives are very expensive compared to a "traditional" SATA 5,400/7,200rpm disk. I paid £250 for 80gb - I could easily have gotten a 500gb Seagate 7,200 for less money.
The drive I got is detailed here:
Intel® Mainstream SATA Solid State Drives
I've been reading a few articles on the Internet regarding replacing the internal Superdrive with a 2nd hard drive. That way, I'll have a fairly small-capacity SSD for the OS and applications, plus a larger 2nd drive for data (I'm thinking 320/500gb).