How do I make a Windows Mobile application with .Net?

I assume you want to develop applications for the Windows Phone 7? In that case, a good starting point is the "App Hub", http://create.msdn.com/en-us/home/getting_started where you may download the latest SDK and start developing. Keep in mind that apps written for the Windows Phone 7 are not comptible with Windows Mobile 6 and viceversa.

In the end I used this: http://www.ward.nu/computer/teletekst/compile.html I got the .cab file from here (after installing .Net Compact Framework 3.5): C:\Program Files\Microsoft.NET\SDK\CompactFramework\v3.5\WindowsCE\NETCFv35.ppc.armv4.cab Unpacked it and renamed all the files according to _setup.xml which in in the .cab. Then I ran this command to compile Teletekst (avaiable on the ward.nu website): C:\Windows\Microsoft.NET\Framework\v3.5\csc.exe /noconfig /nostdlib /r:C:\Users\Eyal\Documents\Mio\CompileCF\NetCF\mscorlib.dll /r:C:\Users\Eyal\Documents\Mio\CompileCF\NetCF\system.dll /r:C:\Users\Eyal\Documents\Mio\CompileCF\NetCF\system.drawing.dll /r:C:\Users\Eyal\Documents\Mio\CompileCF\NetCF\system.windows.forms.dll /target:winexe /out:nosttnet.exe /win32icon:Teletekst.ico /resource:Teletekst.resources Teletekst.cs The output runs on my GPS device like a charm!