If you do a lot of online shopping, consider subscribing to Amazon Prime. $80 a year gets you two day shipping on most items and free streaming. Unfortunately there is no Media Center plugin yet.
Its funny because Amazon's own EC2 service houses netflix. Yeah, I buy a lot from amazon and its a nice free addition if you use amazon a lot. I buy parts and other goods like dry foods from them, with free shipping over a year, saves me a few bones while I can watch some movies and shows. It's slimmer than netfilx so don't expect 300k movie bank. It's more like 5k and most of the B rated or old school stuff.