Here are a few references that should keep you informed--

Photo Techniques Magazine-

Vol. 23, No. 3

Volume 23, Number 1, Page 27, Year 2002.

http://www.photo.net/bboard/q-and-a-...?msg_id=002bJj

http://www.photo.net/bboard/q-and-a-...?msg_id=003CSC

http://www.photo.net/bboard/q-and-a-...?msg_id=005HKJ

http://unblinkingeye.com/Articles/Rodinal/rodinal.html