How do I sync my iPhone to my new computer without losing App data?

Okay, I just recently got a black 13" MacBook & did a clean install of everything on it. I also just updated my iPhone 3G to iOS4, which erased all my music but left my apps & other data in place. When I click the "manually manage" checkbox in the summary tab for the phone & click Apply, I get the error message "The iPhone " " is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library? Well of course not! I have already authorized the account on the new computer & transferred purchases from the phone. My question is, if I go ahead & do this, will all my apps be reset as if they were brand new? I know it sounds silly, but I have HOURS invested into my Angry Birds game & would rather live without music on the phone than lose that game's progress. Obviously, I shouldn't have to choose, it should "just work"....... Where do I go from here? My old computer is long gone but I do still have a Time Machine backup of it on an external drive if I need to pull a file from the old iTunes folder or anything (which I hope not because I already spent hours sorting through & figuring out what I wanted to add to my new computer's library). Any help on this would be much appreciated!

Any luck? I have this exact problem, only I prob have days invested in angry birds LOL. Scares the poop out of me to see that warning.

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