Last year I did a couple of patches for tcptraceroute, which added autoconf and PPPoE support. Tcptraceroute, as the name implies, is like regular traceroute but uses TCP packets instead of UDP, so can work in some places (read: through firewalls) where regular traceroute can't.
I mailed the patches off to the author then pretty much forgot about them. They've been incorporated into the newest beta release. A number of people apparently submitted autoconf patches, I'm not sure how much, if any, of mine was used.