I very rarely ever crash in SL. I just don't. I'm one of those lucky folks with standard equipment on which the client runs pretty well.
So when I start crashing, I know something's not right. And tonight, I locked up twice so hard that I had to force the client to stop through Windows Task Manager. Once when I was editing a land ban list with a notecard open, and again when I was panning the camera around.
I'm not the only one, either. Other SLers were complaining about it too - but maybe some can share their experiences here.