BlackBerry - Desktop Software - BlackBerry Desktop Software at BlackBerry.com
You want to download the BlackBerry Desktop software. I always used 4.2. It looks like 4.3 is out now. You will then have the BlackBerry Desktop Manager and the Redirector. The redirector doesn't really work that well (if at all) with our stuff. Basically, you need to have the redirector there to set our stuff up, but you don't really want it running. You use the BlackBerry Desktop Manager to set up the sync, etc.
The Wiki page has info on that.
Also, there was a bug: 13116 that might have some more info.