If your using 8.5-8.6 with the pci card drivers, it has been known that when the computer goes asleep (with energy saver) on rare occurrences you won't be able to wake back up again.Thats fine for me, sense I prefer a screen saver anyway.No problem in os 9. 

If your using seti@home (http://setiathome.ssl.berkeley.edu/bug_report.html) and have it set to black screen, its the same as sleep (or is relatively close) and It will also do the same.If blank screen isn't on, seti@home works fine regardless.

 

Links

Low end mac's usb page

Apple's USB page

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