PocketScreen is a tool to make screenshots of Windows Mobile. It's been written in VB.NET so you need the .NET Compact Framework for it.
You can set a timer from 1 to 60 seconds (1, 2, 3, 4, 5, 10, 20, 30, 45 or 60 seconds)
Further you can decide to exit or focus the application after capture.
The supported filetypes are *.bmp, *.jpg, *.gif or *.png