Blackberry Curve 8900/9000 users there was a leaked OS today. These download links only last for a couple hours so please download now and decide if you want to install later.
Brent wrote a great article about how to use Shrink-OS. Shrink-OS is designed to remove unwanted components of the installer to make more memory available to install your favorite blackberry apps or just increase performance.
DISCLAIMER: THIS LEAKED BLACKBERRY OS IS NOT SUPPORTED BY YOUR CARRIER, RESEARCH IN MOTION, OR SIMPLEMOBILEREVIEW. INSTALL AT YOUR OWN RISK, AND, FOR GOODNESS SAKE, BACK UP YOUR DEVICE.
Download OS 5.0.0.882 for the Blackberry Curve 8900
Download OS 5.0.0.882 for the Blackberry Curve 9000
[Source CrackBerry]