pegboard is a social bookmarking service that lets you save, search, share and tag your bookmarks with people all over the world!
Jeff Loiselle on creating a daemon with shell scripts so that you can run faster than cron allows.
DaemonTask will help you "deamonize" any cake shell allowing you to schedule it to run with cron (say every minute) and make sure only one instance of the shell is running at any given time.
A really nice OS X front-end for CRON.
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