Bibsonomy to BibTeX
Here is a little trick that might be useful for researchers. I use BibSonomy to manage my bibliography (almost all the references are in the private area, sorry). When writing a new article, I pick the references from my list and tag them with a special tag (for instance, "iswc2008"). Bibsonomy can generate a BibTeX file with all my references tagged with a certain tag, it's as easy as retrieving http://www.bibsonomy.org/bib/user/berrueta/icws2008. Therefore, it is very easy to create a Makefile that downloads that page (using wget or curl) just before it compiles the LaTeX manuscript. Although it is more difficult, it's also possible to arrange things so the trick works even when you are offline (hint: by keeping a local copy of the file).