If you need to hold a print job for a period of time, but forget to change the settings in the Print dialog before sending the job to the printer, here's a solution.
When the printer's window comes up, click the Hold button, then double-click the value under "When. For the date, you'll need to enter the Unix epoch timestamp for when you would like the job to print. In case you're not fluent in UNIX epoch timestamps, you can use this free converter to convert a standard date format into the Unix epoch equivalent.
For example, if I wanted to print something at 2pm Eastern time on November 10 2009, I would enter 1257879600 into the field.
[robg adds: It seems this won't work in 10.6, because there's no When column in the 10.6 print queue window. If I'm overlooking something, please correct me and I'll remove the "10.5 only" tag from the hint.]
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