The 30 days and 25 posts rule is good, but most other forums I'm a part of allow you to post after 6 months or 1 year no matter how many posts you have. I usually lurk and read more than comment, so now I will have to make BS posts to get my count up.
2002 Pontiac Trans Am WS6 (under construction) - 408ci, T56, 9"
2002 Pontiac Trans Am WS6 - stock A4, daily driver
2009 ZX6R - Vance & Hines slip-on, PC V