Yesterday morning, after having been the victim of the all-third-party-apps-crash bug for something like the sixth time, in despair and desperation I downgraded iTunes to version 7.7 using the directions in
this post by darkfiber in this thread. Note that this is a simpler procedure than some have recommended; it does not require restoring from DFU or cleaning out a bunch of supporting iTunes stuff from the hard disk. The downgraded iTunes just comes up with all apps and media intact and in the right places. Since doing this I have downloaded and installed apps at will, both directly to the phone and to iTunes. I have synced the iPhone to iTunes repeatedly. I wanted to give it every chance to return to its bad behavior.
It has been working flawlessly, under conditions that predictably led to crashing in the past. I realize 36 hours of trouble-free service isn't all that long, but given how cavalier I have been about downloading and syncing apps since I did it, I must say I'm beginning to feel pretty good about it.
If the rumors are correct, we'll have new firmware on Tuesday and we won't any longer be constructing long threads about such frustrating misbehavior.