You will probably have more luck if you PM one of the site moderators
http://www.wowinterface.com/forums/s...ad.php?t=30351
Edit:
I can't tell you what to do, and I'm aware of no formal requirements for picking up an abandoned mod,
but since I have done it a couple times in the past I can tell you what I did.
1. Try to contact the author through PM or other public records and try to get his permission.
2. Update/fix what I can on the mod. (this is both to help addon users and to show that I'm serious about maintaining it).
3. PM a moderator presenting any relevant info.
- like author going on record with abandoning the project and offering it up to other developers.
- or outstanding bugs for an extended period of time with no work done.
- my own updates.
- what steps I took to contact the author.
After a short wait I usually get the project with minimal fuss or a reason why not.