Build Tag Naming Conventions

I have been noticing some instabilities of late in release33 version of the
cvsclient. I'm hoping that 3.3.1 will take care of it, so I got that jar off
the downloads page. Now I am trying to get the source, but I'm a little
confused about which tag to check out is BLD200203040100 the one I want or
should I get QBE200203010100-BLD200203041529. Can you all let me in on the
naming convention of the tags/builds for future reference (what does QBE
mean)? Also, is 3.3.1 the best version to go with for a production system?
Release 33 has all the features I need so I am really looking for the most
stable.

Thanks alot, great product. 

Matt