The link on my blog is still up, although I haven't had many chances to post in the last month. You can ask any number of MTG websites for a link exchange, which will improve your standing on Google (I have exchanges with TrollandToad). You can publicize it in Google Wave. There aren't many public waves about Magic right now. If you don't have an account, I can send you an invite - email me anything and I'll send an invite to that email address. (calvinpom (at) gmail (dot) com) Tweet about the website, put it in your signature in MTGSalvation and the Wizards forums, and post in both. Create a Facebook group about it yourself. That will draw users from Facebook. In general, the more links to your website the better your ranking in Google and the other search engines.
EDIT: There already is a public wave about MTG websites. Draw 3 Cards is not currently on it, but I could add you myself if you want.