hmm free bandwidth is pretty thin on the ground, the best I could probably do is running my PC as a server 24/7 or close to it. I am on Wellis Saturn service, I get a static IP, and 128kbps up. Could run guest accounts or something =)
Most of the hosting I know about has 1-2gb traffic caps. I have been using
www.kiwihosting.net.nz , it only cost 75 nzd per year, which isn't the cheapest your going to get but theres heaps of support etc.