BibTeX has been effectively abandoned at version 0.99d for over a decade, but its creator Oren Patashnik has been recorded saying said he is going to work on a version 1.00.
As a user interface tkbibtex [L3 ] has been around for a couple of years. It offers convienient "pushing" of citations to lyx using the tcl-interface of the lyx-server. (joheid 05/22/2006)
See also BibTeX parser.
There is a very interesting approach to parsing bibtex with Tcl in the citeulike plugins dir.
TkBib : LaTeX bibliography manager/bib file editor.