Is there anyway we could add to peoples forum signatures a signed link that showed what they had donated too?
Yeah, I think it would encourage donations. It's something better to brag about than your hashrate for sure.
I think if blockexplorer.com added a new link that was /address/pubkey/forumname/signatureOfUrlUpToLastSlash, then it would check the signature and only display a page if the signature was correct.
I didn't get how it would work? How does blockexplorer know which transaction is from whom? I guess I didn't get the signature part. Can you expand on this?
Continuing on this, Cinfu.com offers VPSes in those price ranges with unmetered transfer, and they accept Bitcoin as well 
+1