Run script as often as possible

[Jacob Larsen <lists@debpro.webcom.dk>]

I have a script that I'd like to run as often as possible.
The script may only run in 1 instance.
My idea is to have a cron script to start it once every hour. The script 
should write a run file, and if the run file exists, exit.
Is this the best way?

Thanks,
Jacob