Nice. Thanks for sharing your experience.
Good to hear you're happy with the cards, although a pity Stalker and Half-life gave problems. Hopefully they can be solved in the future. It's amazing what 2 560 GTX's already can do.
How are the Palit cards themselves? After reading some reviews I ordered a Palit 560 Sonic Edition (Same price as stock model - discount) for a new system, but I was wondering how you feel about them. Are they relatively cool/silent?