Some of us have had problems in the past with some USB 2.0 devices (specifically certain memory/card readers) after a Mac is put to sleep. Sometimes the reader wouldn't be seen after the Mac was put to sleep and then woken up. Very frustrating, and limited to certain card readers (others had no problems at all).
OS X 10.3.3 came out yesterday, and buried in the fixes :
Improves recognition of Hi-Speed USB devices by PowerBook G4 and iBook G4 computers when woken from sleep.
Applied it, so far no problems. If your having these problems, get the update. It might save some hair if your transferring a lot of images and have one of the problematic readers.
Additionally, this added in iPhoto :
Images retain their characteristics when you import them in iPhoto