Services In The Hand is a free helper library for starting/stopping system services on Windows CE 4.x and upwards based devices (including Windows Mobile 2003 and beyond).
It is compiled against the .NET Compact Framework v1.0 and will work under v2.0 also. It's object model is designed as a subset of System.ServiceProcess.dll on the full framework. The download ZIP file contains the dll, and xml documentation along with a compiled help file.