It's not too tricky for the un2400 anymore as discussed in this thread adjacent to the one you mentioned: http://www.geekzone.co.nz/forums.asp?forumid=39&topicid=36790
it's essentially the same as tethering an XT or Vodafone phone. Instead of using the HP Connect software, setup a manual dial up networking connection(i've got the same thing on my Samsung phone with XT and my SE w760i)
Or if you really want an Acer Aspire one like at Noels, goto Playtech pickup the black slim for $599, make sure it's the D250 model as these have the secondary PCIe card built in. Buy a sierra WWAN that supports 850mhz WCDMA/HSPDA from Ebay for cheap. Unscrew the panel, pop in the card and it should be all good to go.
I have moved across the ditch. Now residing in Melbourne as a VOIP/Video Technical Trainer/Engineer.
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