I use a "La Fonera" router at home, and have been tackling trying to get file-sharing working across it with a home server.
Configuration options are sparse on the thing and the only promising approach is "port forwarding".
However, poking around at it for awhile and doing some searches it looks like "windows file sharing" isn't supported.
I ran across FreeWLAN, which looks like it might allow windows file sharing, but since the english documentation is near nil and I'm not 100% sure it will do what I want, I didn't want to deal with flashing firmware.
At them moment I am able to FTP to the home server, but this method seems a little archaic for 2009.
May be it's time to buy a different wifi router, any suggestions?