I kept my original 120g hd intact - still bootable - and my original 2g RAM. Both are in my desk drawer in the off-chance I might have to send in my MBP 2.2 SR in for repairs directly to Apple. No point in taking a chance, especially since in my case I stand a reasonable chance of experiencing the 8600GT gpu problem, and I do have AppleCare. I've heard some conflicting reports of people losing their RAM upgrades and even hd upgrades when the machine is sent in for warranty/Applecare repairs, and others say it didn't happen to them. I chose to be on the safe side here... 🙂