tv via laptop

some of you know that since we moved to la, we don't have a tv. not even a tiny 12" with bunny ears. we looked into getting eyetv, to run through my imac, but we'd still have to pay for a big cable box and a monthly fee, so we passed until we know we're here for good and have somewhere to actually put the box! i've really been missing it, so i did some research and found that i can watch a lot of full episode shows with only 30 sec's of commercials here and there on abc and nbc. shows like ugly betty, grey's anatomy and lost. current season too - one new one shows up each week! does anyone watch shows on their computer?