Just a quick note. I started using CiteULike as replacement for JabRef (I hope that it will abstract the backend interface, allowing CiteULike to act as online store), and picked up an idea from someone to use groups for individual papers I am working on. And, I extended my Makefile (Marcus, yeah, I know I should use cmake :) to download the references in the group in BibTeX format:

book.bib:
        @echo "" >> book.bib
        @wget -O - http://www.citeulike.org/bibtex/group/14384 >> book.bib

BTW, does anyone have experience with the new biblatex?

citeulike  latex