Yes, Qt4dotnet works in Linux - it says so on
http://code.google.com/p/qt4dotnet/. I don't know about Windows CE.
Personally I'm only using Qt4dotnet on desktop Windows for now. Works
fine, although it's quite Java-ish in style and the resource disposal
(calling dispose() on QObject's) is somewhat confusing - it's not
integrated with .NET's standard IDisposable pattern.