Use as modem

Yes; You can install it as a bluetooth modem. It's plug 'n' play, so just make the bt connection, and it will happen. Then you have to make a new internet connection. I don't know what OS you use, but in WinXP you go to connections and hit "new connection". You then choose dial up connection, and then make sure it uses your bluetooth modem. You have to enter in the settings somewhere the APN of your service provider (the phone company you use for your mobile connection). You can just google that. Usually no PW or ID needs to be entered, but you need to enter something in the number to be dialed field. It's something like #99 something, I can't recall. You can google that too. That number tells your phone to use gprs/3g/3.5g/etc. in stead of the old fashioned dial-up-connection.

/Brix

Is it discoverable by the wireless provider if you use that app ?
is it free to download this app ?
how many devices would it support ?
Thanks

Tried Joikuspot with my Xoom, but Android devices will not use ad-hoc networks.  For some reason BT will pair both devices but not tether them.  Next step is to try USB cable connection.

Thanks for the advice.  I've decided to try one of the mifi devices, where you plug in a sim card and get what is effectively a 3.5G to wireless conversion.  It's a "proper" wifi and not an ad-hoc, so the Xoom should see it ok.