I have Destinator 6 for my Dell Axim Pocket PC and a Bluetooth GPS receiver. I have maps for Australia, Europe, USA and Canada. It works well, but needs a little more tender loving care than a dedicated GPS device (like any Windows Mobile device does).
If you buy a bluetooth GPS and/or software from
BuyGPSNow.com, they will usually include a free universal vent mount suitable for most PocketPC devices.
I bought my Bluetoth GPS receiver from a company that also sells them on eBay, though I bought mine directly from their web site for the same price as they sell on eBay.