-If you dont have time for SEO at first, just make your system flexible enough to do it later.
-Dont be your own worst enemy by initially building in things that block you from being found.
-People dont search for things using shiny new web 2.0 words without vowels. Those are made up words. No really.
-Its OK if your site isnt 100% SEO friendly. Neither is Sphinn.
-You can indeed go wrong with user-generated content. But you can go right.