Go to the forum section about your device. near the top will be a "sticky" post that will have the latest OS leak. Follow the instructions and you'll be all set.
One caveat- if you aren't comfortable with the possibility of screwing it up, stick with your current OS and wait until your carrier releases an official update.
I recommend you to check out the RIM Official site to find out the reviews about OS 6. It has not yet officially been released but there are rumors about a new operating system.