(hm, don't really know where to put this RFE; tetex seems closest ...)
sixpack is the best graphical bibtex frontend I know (including more
filters than any other frontend). Think it should be included
in powertools (at least). See http://sourceforge.net/projects/sixpack/
I'm going to close this since Powertools no longer exists, and it looks like
sixpack hasn't been updated in a long time.