Is it ever "not safe" to close the lid with running programs?

I'm new to Apple (and loving it) but have a basic question about closing the lid.  Is it safe to close the lid (entering sleep mode) when I am running a bunch of programs.  Or should I shut down programs before closing the lid?

It depends on the nature of the applications. I certainly would not sleep a computer in the process of installing a program or performing an update. Sleeping a computer in the middle of a download or file transfer tends toward unintended negative consequences. This would also apply when in the middle of a backup.
The general rule I suppose is don't interrupt the performance of apps which are adding or changing files. Some do better than others at resuming the process after waking.

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