Any Simple plugin example available for a beginner?

[maxispin]

I would like to get into the world of plugins so I can give one day something back to the community.

Does anyone have any Simple VM2 plugin example to share so I can study and see how it works? ( a workable example file etc )

Please. 

[PRO]

http://dev.virtuemart.net/projects/virtuemart/wiki/Plugin_system