I too was looking for onboard first in Applications->Universal Access and only found its menu entry after reading this bug report.
There are now two hidden entries under System->Preferences, one for configuring it and another for running it. My suggestion is to leave "onboard settings" where it is now in preferences and move "onboard" to the "Universal Access" menu.
This is still an issue on Intrepid RC.
I too was looking for onboard first in Applications- >Universal Access and only found its menu entry after reading this bug report.
There are now two hidden entries under System- >Preferences, one for configuring it and another for running it. My suggestion is to leave "onboard settings" where it is now in preferences and move "onboard" to the "Universal Access" menu.