True. I am not paying Hulu to watch TV content on my computer, but I am paying them to watch TV content on my TV.
We used to spend $70 on satellite with a Tivo, we now spend $8.99 on Netflix and $15 on basic cable - though the cable rarely gets watch and will be replaced with OTA in the Spring. Adding HuluPlus into the mix for $7.99 will add to our choice.
Though it will only add a little, I don't think that Hulu is carrying enough content yet, but I am will to vote with my pocket that I prefer the steaming model over cable.

Thanks to Bruno and Matt I won't be adding a Boxee any time soon. There is a lot of content available on various website, and Boxee is a route to getting that on the big screen, but if they feel the UI is poor, then it is not going to pass WAF.