Got tired of the green cable that ran from the back of the router downstairs, up over the back of a hanging picture, wrapped around a light fixture, then around a banister, then draped across the floor of the landing upstairs.

Went looking for some Powerline carrier modules, and settled on the Belkin 200 Mbps model (though I paid less than that link).  The pair arrived today, and took all of 2 minutes to hook up.  No hiccups at all, no software required (there is software, but I can’t think what it might do that would be useful to me).

Now all I need is a 2-way or 3-way power block for downstairs so I can remove the long extension cable, and then the additional phone cabling and it’ll look a lot neater.