why are all my apps crashing???

Reboot (happens sometimes but less often if have the latest firmware).

To reboot hold BOTH the home and LOCK button down.
Do NOT let go when it says slide to turn off.
Keep holding until you see the Apple Logo.

it didint work! Agh I want my apps!

Here are a couple of articles from the apple support website that might help out.
http://support.apple.com/kb/HT1737
http://support.apple.com/kb/HT1414
http://support.apple.com/kb/TS1275

You might need to reset and or restore the iphone to resolve any software issues.

Hope this helps.

I have the same problem. Rebooting doesn't work. Re-syncing doesn't work, either. It just started last night. Every downloadable app that didn't come pre-installed crashes while it's loading.

I downloaded updates to the Facebook and Bank of America applications. I don't know if it's related, but I thought I'd throw it out there in case anyone else did the same.

What firmware version do you have on the iPhone...most apps (especially updates to previous apps) require 2.2 minimum. While the AppStore on the iPhone fails to tell you this, if you look at the app via your computer/iTunes you can see the requirement. If you put lets say the new Facebook app on your iPhone and your iPhone is not 2.2, it will not work....but I sort of thought it would tell you but could be wrong.

I have 2.2.

I just deleted and reinstalled Facebook and everything works now. Looks like Facebook broke it?

Bump, same thing just happened to my MySpace app, thought I'd share again.