Mike Lin's StartupMonitor small utility that runs transparently and notifies you when any program registers itself to run at system startup. More information
Peter Bright
This is a great free applet from Mike Lin that helps protect against self-installing applications wanted or unwanted.
StartupMonitor is a small utility that runs transparently (it doesn't even use a tray icon) and notifies you when any program registers itself to run at system startup. It prevents those utterly useless tray applications from registering themselves behind you More information