From Phil Windley:
"If you use BibTeX for managing paper references (and after all, who doesn’t) and you use a Mac, then you should know about BibDesk, an open source tool for managing BibTeX bibliography files."
Well I don't have Mac OS X ( gasp!) so I went looking for Linux alternatives and came up with KBibtex. Debian and Ubuntu folks can get it via here. Looks good, but I will report back later after more use.