I also dont use any tools - one problem is that Google tends to look at the better known tools as a violation of their TOS - and if they see certain keywords really hitting their database they have been known to look into it
I use server logs and stats - AWstats is a really good tool for looking at keyword stats and usually your host can install it for you if you're not comfortable doing it
for future planning tools I always use some of the better keyword tools like Overture, Google Adwords Sandbox and
http://www.digitalpoint.com/tools/suggestion/ that Tommy turned me onto some time back