Totally swiped this from a Linux Journal podcast, but it was so good I wanted to write it down for future reference:

# ssh -N -D someportnumber username@somesshserver

Then, enter your password and configure your browser to use SOCKS host version 4 or 5 with localhost and the port you used.

For example:

# ssh -N -D 1080 jim@11.22.33.44

Browser configuration:

ProxySettings