Oh, and I have a few quick questions on gaining initial users. Other than mass-mailing bloggers and submitting to twitter directories, what have you done to bring traffic to your site? Also, I'm interested to know unique visitors vs. free users vs. paid users, as I'm sure many others here are wondering as well. Do all free trials end up converting to paid users? Also, how have you handled existing customers when experimenting with price changes? Do you keep them on the plan that they signed up with, or do you apply the price changes to ALL customers? Please share with us!