A few days back crackberry.com announced that a leaked version of OS 5.0.0.348 for the Blackberry Bold 9000 had been found. Here is a torrent for the firmware file, and it seems to work, so if folks seed you should be able to get a descent copy.

9000M_PBr5.0.0_rel546_PL5.2.0.23_A5.0.0.348.exe.torrent

Disclaimer: remember, this is an untested and unsupported version of the firmware for the BlackBerry Bold 9000. If you have problems with this firmware, you are on your own. Not your wireless operator, RIM or I will be able to help you, so you are flashing your device entirely at your own risk. Also, if you have a company BlackBerry, you may be violating your IT Policy by installing this firmware, and this could get you fired!

Update: This version (5.0.0.348) has been reported by AT&T users to cause a reboot-loop. Check this post BlackBerry Bold 9000 OS 5.0.0.348 Does Not Work with AT&T. Either way, you probably want to take care using this if you are using AT&T in the USA on a Bold 9000