Search Engines ARENT everything!
Most of our traffic comes from "word of mouth", traditional marketing methods, and newsgroups.
With our commercial sites we have found that partnerships with non-profit, and informational sites provide the greatest rewards. If you site is good enougth you'll find that the users will spread the word, via email, messageboards and word of mouth.
If you can get to the top the of the Search Engines, thats great, but if you choose to rely, on a particular link or a cetain position in a SE then your destined to be dissapointed at some time or another.
Just my two penny worth.