Why? Just watch Netflix on your laptop or iPhone! (see FlybyKnight above)

Also, look into Boxee (installed on my laptop), XBMC (also on my laptop), Hulu (website), etc. Plenty of ways to watch all of your favorite shows without a Slingbox. Channelsurfing.net is great for sporting events.

FWIW, I've had a Slingbox for almost 4 yrs, but my local ISP decided to start port blocking so I can't get it outside of the home network (I live in a very rural area with only 1 real choice for anything close to high speed internet, but fiber optic via the phone company coming soon).