Because the question of ranks comes up so often and related posts are so hard to find, I thought I'd post a list of ranks here. Remember, the idea of ranks is a reward for those dedicated fans, and running up your post count just to achieve a new rank is not recommended and often annoying to other users.
Forum ranks
Suspiciously Absent 1-25
Casual Observer 26-125
Lonely Fan 126 - 250
Enthusiastic Fan 251 - 500
Devoted Fan 501 - 1000
Thor's Hammer 1001 - 1500
Owen's Helper 1501-2000
P. Monkey's Agent 2001-2500
The Order of Denderah 2501-7500
Hymn of One 7501->