To promote its online video services, Yahoo will be temporarily offering up two comedy shows for free to anyone who wants to watch. For the week following January 2nd, Yahoo will offer them via stream, including previously aired episodes. “Two and a Half Men” and “How I Met Your Mother” will be there for interested viewers. More companies have been increasingly turning to online video in an answer to greater demand for Internet entertainment. A few months ago CBS started offering various shows in one form or another, sometimes with restriction and sometimes without, on their website. The idea is obviously catching on.