I think it may have been discombobulated again. (Actually, last I heard it was under a different url, but I forget what it is) You might wanna try Wordtracker though, they also have a free keyword lookup tool. Best of luck! -Hagen
It's more than likely that their tool has been "confunkulated" and turned into some other quasi adwords tool.
they took the tool down but it is still avail for the uk...but this tool sucks in comparison to wordtracker
I think that I have been facing the same problem, the tool has been so abused that instead of adding some securtiy checks like a captcha or something they have taken it down. They should put something in its place though.