So many complaints about Bridge crashing frequently ... strange!
I used to have a lot of troubles with Bridge 1.0.4, 2.0, and 2.1. Frequent crashes, or no response to key presses, or painfully slow speed.
But since I switched to Bridge 2.1.1, it now is running surprisingly smooth. And pretty fast, too! Building the cache for a folder containg, say, 800 image files now takes one or two minutes rather than 20. So it's the best Bridge version I ever used and the first that I am fairly happy with. However, I acquired the habit of waiting for the little radar icons to stop spinning after each action ... this seems to help keeping Bridge healthy.
I also updated Photoshop CS3 to version 10.0.1 and all the other CS3 applets to their latest versions, too. I am on a four-year-old desktop PC with an Athlon 2400+ CPU and 1 GB of RAM running Windows XP SP2. By the way, I disabled all copies of AdobeUpdater.dll on my harddisk (there are a few of them)---maybe that's the reason (or part of it) why Bridge is running pretty stable on my machine ...
-- Olaf