Thanks to Vista's/Win7 UAC system, you can log in as administrator and, however, run everything without elevated privileges. Once you need elevated privileges, you get a prompt and the program starts in elevated mode, but still under your credentials. From the SystemExplorer there is, as far as I can tell, no way to tell whether a given process (NOT SE itself) is ran at normal or elevated level. Could that be implemented?
System Explorer already contains this information. Right click to Processes tree header and add Integrity Level column. Non elevated processes should have Medium level and elevated should have High level.