Well I ended up on the phone to Apple this arvo twice, as not only are my apps crashing, but they won't update (
https://forums.macrumors.com/threads/537833/)
They went through several things, which included a restore, and still no go.
Then we completely restored the firmware and didn't use any backups so that we were at a completely fresh install with 2.0.1, and then reconnected it to iTunes and sync'd all the programs on, and guess what.... the apps STILL crash after less than 1 second of trying to load.
I was in a hurry tonight when I spoke to them the 2nd time, so they are ringing back tomorrow morning to continue trouble-shooting with me (I have been dealing mainly with Product Specialists - so not the normal helpdesk staff).
I will let you know how I go. I am using iPhone 3G, with a Macbook Pro (running 10.5.4, and iTunes 7.7.1).
Hopefully we can fix the problem with my apps crashing all the time.