1. Find the most popular forum software providers. I just came up with the following list to get started: vBulletin SMF Expression Engine PunBB 2. Look for the footprints these forums have such as: Powered by vBulletin So you've arrived at this Simple Machines Forum Powered by ExpressionEngine Powered by PunBB 3. Search those terms in Google in phrase match 4. Sort the list by PR. You can use SEO Quake plugin for Firefox to do this. 5. Create account in those forums 6. To stay under the radar, after a while come back and put your link within your profile page. How to get them indexed fast: 7. Take note of your profile page URL 8. Bookmark all of those URLs 9. Ping Your bookmarks 10. Create a blogger account and put all those profile URLs in yout post 11. Bookmar your Post 12. Submit your blogger RSS feed to RSS directories. Cheers!