If you don't already know what Canabalt is, just go here.
If you do know, then hey -- you might be pleased to know that the soundtrack is now available for download. Each track costs a minimum of one dollar (but you can pay more if you want), while the entire five-song album costs three dollars (but, again, you can pay more if you really want to). Come to think of it, it's not really a "pay what you want" sort of a thing so much as it's just a relatively cheap soundtrack.
Either way, you can get it here. An enhanced version of Canabalt is also still available for the iPhone and iPod touch.
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