Lion suddenly wont boot!

Hi
So. Suddenly my Macbook5,1 running an updated Lion won't boot.
I was playing some music through Airfoil and having a few other programs opened, put it to sleep, and when the Macbook woke up again, the spinning wheel of death appeared every time I pushed anything. So i shut it down by holding down the sspower button.
Then, when trying to start it again it hangs at the Apple logo and the spinning progress bar. I cannot boot into Safe Mode and I also tried resetting the PRAM.
I can to the Recovery partition, but repairing disk and permissions didnt help, and new install isnt a solution right now as it is a few weeks since my latest backup (stupid, yeah I know)
Do any of you have any suggestions of what went wrong or, more important, how to fix it?
Thanks in advance!
Jeppe

Thanks! That did solve my problem!
However, as I rebooted the same problem seemed to occur: some files are unreadable, system hangs for a bit. I cant even backup via Time Machine. Even when I try to copy-paste single folders, it hangs a specific files. I can of course delete that specific file and try again, but then another file will hang. This process can take a while.
I guess maybe bad blocks or even a damaged harddrive
Any way to vypass this problem? Maybe by maki an image of the disk?

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