> So does anyone know any other ports
> that Gnutella is known to work on?

If your university/company does block incoming traffic from port 6346/6347 then you can do nothing. Most users use those ports, according to my hostslist.
If you are not a geek you can try finding some users which use different ports, so do you. If you are a geek you can tunnel traffic via another computer/protocoll (e.g. portforwarding or socks2http).

However gnutella traffic is expensive or violating copyright in your country and that is the reason why it's forbidden at your place. For sure there are technical solutions to get arround (see above), but at least the high traffic will point back to your IP. Make sure you know what you are doing.

Hope it helps, Moak