I believe .net Compact Framework 1.0 is already included in WM5. I looked in Microsoft pages and found some references to .net CF2 but did not find a download. I did find information that suggested it could be updated without a ROM update. And that some OEMs may offer updates. Maybe that is what the wireless radar site is offering? Here is a link to a .net CF 1.0 SP3.
http://www.microsoft.com/downloads/d...DisplayLang=en