with 2 pcs, it doesn't make any sense to use a hub, unless you want to pay $10/month for the second IP
a
router, around $100, is the best solution. In addition to only 1 IP address needed, it also means you can shut down either PC without worry about the other one.
if you are willing to have one PC on all the time, you can put 2 network cards (or use USB for DSL modem and network card to connect to the other computer) in the one computer, hook the other one to it, via a
Crossover Cable, basically a normal ethernet cable, but certain wires are switched within. make your own, or buy it.
then, you need a
Proxy Server
oh, and if you use AOL DSL, where you have to run AOL program to be online, only the latter method will work, but then, only one computer, and one person, can be using AOL.
AOL keyword: BYOA