All lead generation companies want the same thing: your money.
You would be better off spending money investing in a good real estate blog (such as the Real Estate Tomato) that is professional and search engine optimized.
http://realestatetomato.com/ They will build you a beautiful blog from scratch and help you learn how to blog effectively.
Another good one is RSS Pieces..
http://www.rsspieces.com/Get terrific advice and tips for free at
http://www.activerain.com Basic membership is free, and that's all you need to learn how to blog for business - join and read from the "masters."

Then start your own free blog at Wordpress.com
I for one learned how to do it on my own, for free - but a lot of agents are unwilling to take the time (if they're not selling real estate what ARE they doing with their time?) to learn.
I would go to my grave swearing that
if you do it right, blogging will bring you more business for less money than any lead generation
scam company.
Combine blogging with IDX links to listings and you're set. I get compliments all the time from my customers about my blog and website - how simple and easy it is to use. And the proof is in the pudding - I've outsold many of the folks who have been in the business longer than I've been an adult..LOL