www.TheFireflyProject.com is my website. I've started an email list, done a tiny bit of ad copy for it (however horrid it may be) and I've been using MySpace, which has been working pretty well. I'm getting about 200 uniques a day just from MySpace. I have about 5-6 people signing up for the newsletter every day. I also have been running Adsense ads, cheaply of course, I don't have a lot of money to spend on it right now. Outside of those three arenas, what do you feel would be a good way to advertise?
You could ask people to link to your site in return for a link or mention on your site. That wouldn't cost you a thing. Try to find sites similar to yours.