I didn't realize you could do this, but I just tried it with my desktop PC and I got a 145 kbps link and I could download at 16 killobytes per second. Even web pages loaded relatively fast.
But here's a question: Can you set it up with multiple phones for additional bandwidth? Becasue sprint allows you to add phones to your account for $9.00 each. With two phones there would be two channels. But does windows support this? (distributing bandwidth over more than one modem)
If so, this could be awesome. Streaming video from home....I could have digital cable in my car

Now that would be nice