If you have installed some additional visual effects for iChat and Photo Booth, these may cause those programs to crash.
As a workaround, I found that running iChat and Photo Booth in 32 bit mode (Command-I on iChat and Photo Booth icons in the Finder, and set 'Open in 32-bit mode' in the General section) ended the unexepcted crashes.
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Mac OS X Hints
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