Between Dec. 27 and Jan. 2, Yahoo! TV will be offering episodes of "Two and a Half Men" and "How I Met Your Mother" for free. Granted the latter show is not worth your time, the episodes of "Two and a Half Men" available are great. But beware, don't get hooked on Yahoo! TV as it is planned to compete with iTunes' video store. But take advantage of it while it lasts.
These episodes are available commercial free.