Wally Grotophorst from GMU says: "OSCR uses Perl & MySQL to provide electronic reserves services at an academic library...." and that they are "entering their second year on the product." Download it yourself at timesync.gmu.edu/OSCR, it is under the GPL.
as seen at freshmeat, and at SIXPACK site: "SIXPACK is a free BibTeX and Reference Manager designed to edit, convert and manage reference files, search and sort bibliographies, import and export many different bibliography types. Sixpack uses the excelent perl package bp by Dana Jacobson to covert between formats." and it reads/writes bibtex, refer, endnote, tip, procite, rfc1807, and plain text along with one-way for several others. written in perl/tk... looks real good.
We are on: gather at 8pm Sunday 6/27 at the *end* of the Ariel Users Group meeting, located at Room 227 of the Ernest Morial Convention Center. We shall then proceed en masse to the RLG suite for the first ever live gathering of us types, replete with frosty beverages and a very special guest via teleconference. See you there!