Assaf Hershko recommended the Tapuz broadband and networking forum as a good source of info on ADSL and home networking.
Right now, I have my girlfriend’s PC hooked up to mine, and mine hooked up to an ADSL modem. There still are some bugs, but it seems to be working.
Yes, I did this before, and undid everything when I couldn’t get it to work smoothly. But I’m giving it another try…