[Mr_Gee]

I'm also looking for a software solution.
While I'm at work I need to disable all network connections to be able to use
my mobile to surf the "blocked" sites.

It would be great to only have to change the Proxy in the browser, I could even have a dedicated browser for this...

-=edit=-
I've been playing around with your suggestion, but indeed it doesn't seem to work on my diamond.
I think to get it to work you need to get the source and compile it (think i read that somewhere)
unfortunately i couldn't find any other SSH servers for the PPC