Google Code has a project that wants to create a .NET library for the OpenStreetMap API. The website says there is currently an alpha release, so it might be worth checking out this: code.google.com/p/openstreetmapnet
And there are two more similar projects on CodePlex:
osmscout.codeplex.com
gmap4dotnet.codeplex.com
Maybe they can also be used in the Compact Framework, or you could ask the project team to add this function (or use yourself, after all, it is openource).
Tom
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