I will see if I can keep this list update with some of the tools I have created:
Some of these are right click tools, stand-alone tools, others are pushed via an advertisement.
*Client actions for a collection
*Status Messages for a computer
*Change a client to Internet Based
*What collection is a user or computer in, does the collection have a maintenance window
*Add a computer to a collection (command line)
*http://www.sccm-tools.com/
*Add a computer to a collection (right click)