I just learned of a nice trick for BlackBerry.
Just like safe mode in Windows XP, you can boot your BlackBerry into safe mode where it will not automatically load any third-party application. This can be useful for situations where you have something that is making your BlackBerry unstable.
This works with a battery pull or doing the hard reset key combination (Alt-left-shift-del). Right after the red light goes off, press and hold the escape key until the boot is complete. You will know that you are in safe mode because it will say “safe mode” in the top-middle of the screen. This works on my BlackBerry Bold.