[Velocd]

Inactive members is the worst part about forums, but also the biggest part. On my forum I have a small group of members, although most of them post regularly on a daily basis. I delete members who fail to reach 10 posts and have been inactive for 5 days, because those members usually aren't coming back. It might "look good" having a forum with 9000 members, even though 6000 of them are inactive a great deal of the time (while 3000 of those have a 0 post count).

The only flaw to this strategy is most people like to join see the registered members, and instantly think all members at that forum are active members and post regularly. Which is almost never the case. This is why I'm fairly soon going to devise a system to fix this..

Anyway, to not get carried away from the topic. Putting links in your signatures is always a pretty good way to get attention. Join other forums also, and become a poster there, and if you're liked enough there people will become curious and visit your links to your site.

Going to chat rooms is also a great way for advertisement :P
(even though 99% of time you get banned after the first link)

Also go for affiliate programs/banner exchanges, or anything else that means promotion.