My new favorite is Penguin-Cam, at the north end of the Antarctic Peninsula. If there are no penguins in the view right this minute, try the slide-show.
There are some webcams closer to home, though they never have penguins. There's the Santa Fe Plaza Cam, presently accessible from the Santa Fe Hotels page. KOB-TV's cam page shows a number of cams around the state, as well as some further afield (Zion National Park is looking good this morning). There's cams in the Cumbres & Toltec Scenic Railroad yard in Chama (scroll to the bottom of the page to see the cams), in Valdez near Taos, and at a few ski resorts (try Taos Mountain), but Ski Santa Fe doesn't seem to have one.