I am trying to troubleshoot why my timer job is not working in WSS 3.0. Is there anyway to run a timer job manually in WSS 3.0?
I don't believe there is an out of the box method available. You can do it by manipulating the start and stop times and activating / de-activating it. But it is of course a little clunky.
There is a tool on codeplex available that "kind of" lets you do this from Central Administration:
The "kind of" is in that for one-off schedules of jobs, it creates copies of the timer job.