A number of cheese crashes, the common denominator seems to be changing modes, e.g. changing from video to photo mode, changing resolution via preferences, changing effects. Essentially anything that attempts to restart the capture engine. Also occasionally starts in magenta, maybe related. Abrt doesn't seem to capture it.

dmesg:
[ 8871.713841] video_source:sr[2486]: segfault at 7f91668aa008 ip 0000003e7e27b08c sp 00007f918f7fcac8 error 4 in libc-2.14.so[3e7e200000+18f000]
[ 8871.735328] abrt[2502]: invalid number '/var/spool/abrt'
[ 8990.688539] video_source:sr[2567]: segfault at 7fc05cbdb008 ip 0000003e7e27b08c sp 00007fc0c0ff7ac8 error 4 in libc-2.14.so[3e7e200000+18f000]

hardware: Logitech C270 HD USB
Bus 001 Device 005: ID 046d:0825 Logitech, Inc. Webcam C270

software:
cheese-3.0.2-2.fc15.x86_64
gnome-video-effects-0.3.0-1.fc15.noarch
kernel-2.6.40.6-0.fc15.x86_64