This is my first Instructable, so please bear with me.
This method, provided you can run the two programs necessary, will enable you to bypass ANY web filter, without the use of any proxy sites that can be blocked. Many people tell you to go to sites like boredatshool.net etc, but these sites can be blocked, which will put you back at square 1.
To prove that this works, these screen images were taken while I was drafting this Instructable to prove that I was using this method from school, where www.instructables.com is a blocked site.
DISCLAIMER: I am NOT responsible for you if you get caught. do this at your own risk.
Step 1: You will need:
If you are blocked from downloading or installing programs on the blocked computer, or you dont have any storage space on the computer you are using, or you want to be able to use this on almost all computers, you will need a USB flash drive. you can pick these up from your local target, walmart, bestbuy, etc for like 10 or 15 bucks. If you need a flash drive anyway, get what you want, but for this, you won't need more than about 50 MB of disk space, and that is a very generous estimate.
the rest of the things you need can be gotten for free.
USB flash drive (if necessary)
mozilla firefox, portable edition
PuTTY, portable edition
shell account with rootshell.be (here it is free)