It's interesting to think of a system to support development of open source software, providing monetary compensation in addition to that feel-good feeling. The other day I was thinking if we could almost have a standardized commit message for developers seeking tips, something like <public bitcoin address><clearsignature of address with developers pgp key>, so that one could do this on a direct basis (and with certainty that their funds reach the dev).
This is NOT to say that I don't trust tip4commit, not at all. Think of the previous paragraph as an aside, a thought on how to tip in a way that guarantees all tips go to developers. If arsenische were less trustworthy there might be a greater argument, but I think people familiar with bitcointalk will know he's cool.
It's great to see an easy, less-painful, automatic way to have this done than simply looking up dev's addresses on an individualized basis (tedious if you like lots of projects).
Cool stuff.