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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My wife and I both have the DX, but if we place our phones side by side, my reception is stronger all the time. We have the same setup. Rooted, Tranquility 3.0 rom.
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If he plays call of duty black ops, get him the limited edition wireless controller for the 360, don't know if they have one for ps3.
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I'd stick it on my Acer Netbook that I use strictly tethered to my Droid X 3g Mobile Hotapot. All I have installed on it is Chrome, RSD Lite, adb and rooting tools.