Make your signature catchy and post in related forums! Try social bookmarkings! Provide some free books/softwares! Check for more ideas at General Marketing section of DP!
Learn how to use BB Code and you can do lots of fun things with your signature... http://forums.digitalpoint.com/misc.php?do=bbcode
hey thanks..thats why you are a mod..i never knew that... @ OP try social bookmarking, link exchange..these can bring good traffic in short time..
There's always Adwords if the return on investment is worthwhile. Also find some appropriate blogs or other websites and buy ad space.
StumbleUpon and Digg. Both are social bookmarking sites, were you can submit your links and other people can find them.
Be a great member of various game forums. Not "Bob's gaming forum" but the biggies. I participate as a general asswipe in the Bethesda, Bioware, LucasArts, and Blizzard forums and get a TON of hits from those. Be a member of the forum that people either love or despise. Make yourself a presence there. Another tip for anything gaming related is sign up for EVERY gaming survey site. You will get NonDisclosure surveys often for upcoming games which gives you a huge leap on what is coming soon. I took a survey for the new KOTOR MMO about 3 years ago. Damned if that isn't coming out in the next year or two now. I missed one hell of an opportunity on that.
Try participate in big forum and buy some sig link from others, it can drive you in certain amount of traffic for sure