What services can I used to find a user's location based on their IP address?

Question

If you need to locate a user based on their IP address, what services are available (free and not free services are fine)?

P.S. I understand that some users use prox

Answer 1

I have used hostip.info to grab client location informaion when forms are submitted on some of my aspx pages. Here is a blog entry I wrote on it a while back www.fencerowproductions.com