EN: Google Labs just lauchend Goolge Code Search - I think the name is selfexplaining ;). Searches can be perfomed with fixed strings or regular expressions. Nice that even the wanted license of the code can be specified in the query.
Update: There some nice posting (e.g. on O'Reilly's ONLamp or Bugle) about using this new service for searching for security bugs in software. It is again really interesting how much influence the interfaces has. The sources are out there for quite a while but Google gives now a possibilty to search certain patterns so easily. I hope this makes people more focused on security aspects when coding.