Here's another idea brought back from the dot-com morgue. "Verizon One is a 5.8 GHz cordless telephone, high-speed DSL modem, 4-port wired and 802.11g wireless router with a colorful touch-screen display. It's got news, sports, weather, stocks, even local movie listings and showtimes" (via MocoNews).
The golden rule of advertising - if something has a screen, it can display ads. This one should be able to display contextual ads, too, like the 411 guys. Imagine calling a restaurant on this thing and seeing an ad for a cab service or for a competing establishment.