Sling Media has a converter box that streams your TV over your home network connection, and you can use this on the BlackBerry. You get all the same channels, can change them, order movies, etc. Anything you can do at home you can do with this.
I have a friend who uses Slingbox with his Verizon Storm. I was quite impressed when I fiddled around with it a bit. I think he's pretty happy with it.
Posted from my CrackBerry at wapforums.crackberry.com