Your layout is missing something. Add a logo, favicon , H1 titles, and make an option to search by PageRank.
I really like the site and its not a bad domain name. Its very useful and its a great concept. I actually havnt seen any like it and I really like domain name tools since I buy/sell domains. My suggestions would be to add ad a godaddy affiliate link. it pays $2 per registration and that would be easy money. The next thing I would do is got to hostgator.com or cj.com and signup for hostgators affiliate program or any other web hosting program. They pay really, really well! I would also add an email form and capture email addresses. Maybe you could send cool domains of the week or something. There are lots of places to go if you can build a good list. The last thing I would do is to get a web designer or someone to maybe spice up the design. I would be willing to help for free if you need some ideas.
Thanks for suggestion.Each domain is actually an affiliate link to Godaddy already. Newsletter is actually very good idea.
Script works, but it don't appeal to me. No good header, ads looks like they just have been placed on random. Colors look awful.