I've set up a search engine which indexes Debian's source code: http://walrus.rave.org/source/
Currently, unstable main and contrib are indexed, in total 70 gigabytes of source. (It would probably be nice to have stable and testing as well, but I don't have enough disk space available. I skipped non-free in fear of annoying licenses.) The software used is OpenGrok, originally developed at Sun for OpenSolaris (http://opensolaris.org/os/project/opengrok). It's quite nice, although a bit slow with this amount of source code. -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org