Here is a good how to http://www.how-to-hide-ip.info/2009/...e-and-janusvm/
on hiding your ip. Also, you may want to look into a mac spoofer just in case (not sure what you're planning to do). Unfortunately you are never anonymous on the internet and there is always SOME way to track you down. If someone (not a regular person, but a government agency) wanted to track you down they would find you eventually.
You can hide your IP all you want, you can spoof your mac address and you might get away with a few things, but eventually you are going to screw up and do something that leads back to you personally. Like using Tor to log in to this website for example leaving behind the same IP you were using to do who knows what (but something you shouldn't have been doing in the first place). Just be careful but know you can get some anonymity out of Tor, but not the "ooooh i can do anything I want and get away with it" kind of anonymity.
Also, a useful link for people is http://yauba.com/
it's the world's first privacy safe real-time search engine. It's nice because you can search anything you want and they don't keep record of anything you search for on their servers. Also, if you want to say connect to google.com through yauba you can actually choose "visit anonymously" and it connects through their proxy server. It is a little bit slower, but worth it if you want that extra piece of mind you aren't being tracked. May the force be with you.