I've had eight since I installed 10.6.1 on 9-11. Three were with Safari, which the kids use predominantly. The history file doesn't seem to offer times, so I'm not sure whether it was something on the web site or with Safari.
Two are with TextEdit, which I believe might have been my attempt to open a really huge file and it didn't work.
One was with Camino, which had an issue downloading a file from MacUpdate.
One was with iPhoto and the other was with a freeware solitaire game.
Although judging by my crash reports, these are more frequent than Leopard or Tiger, nothing was remarkable.
Interesting, though, how "Crash Reports" are now "Diagnostic Reports." Wee bit of spin in the bowels of the Mac OS.
mt