Tether App

It is awesome! I have not used it with my X yet, but plan too. I have used it in years past. I have used it primarily when I am on vacation/trips, where hotels charge for wi-fi. It isn't the fastest in the world, but works for e-mail, general browsing on your laptop.

I have been pleased with it.
 
BTW--- it is a two part software download. Your phone needs the app, then your laptop needs the software. You basically 'connect' on both devices and you are set to go.
 
There a hack for the built in 3g mobile hotspot app but you have to be rooted. Works better than ad-hoc tether connections. Search for it over at xda-developers forums.

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