I remember your post when you guys launched. I went to your site and spent about 5 minutes trying to figure out what the hell it was. I see now that you've greatly improved this, and added several clear examples that show it. Great work!

Do you mind answering a couple of question? I'm curious how you guys have advertised this product, and where your users come from.

yeah no problem - shoot me an email if you want. we took a lot of feedback on board from that HN post and really changed the layout since the initial launch. Most of our traffic comes from blogs and StumbleUpon! We are also now on the first page of Google for some relevant search terms