The thread with the titles is "Nothing like spoiling the punchline" and the ranks are given thusly:
(If you don't want to know don't drag your cursor across the following.)
0-24 stranger
25-49 newbie
50-99 journeyman
100-199 member
200-399 enthusiast
400-699 addict
700-1,199 old hand
1,200-1,599 veteran
1,600-2,499 Pooh-Bah
2,500-3,999 Carpal Tunnel
4,000-9,999 Turtle
10,000-? Master Aster :)