Lots of info on their website. Slingbox.com - Slingbox shows the 2 current models. The big difference is the HD model allows you to connect extra devices and has a built-in tuner. The HD aspect is of limited value because it all depends on the speed of your internet connection.

The biggest challenge is normally getting the internet connection to the slingbox. Unless the slingbox is right next to your home router, you will need buy some type of wireless internet bridge device to connect the internet to the slingbox.

Google for "slingbox price comparisons" for best deals. The phone app is $30 but worth it when you are killing time somewhere.

Geek it up by also getting yourself a travel router. You plug the wire into it and then you can go wireless in your room. That allows me to make skype calls and watch slingbox on my iPhone without turning on the computer. Also allows me to set the computer next to the TV and feed the video from my computer to that big flat screen for better viewing.