Seeing as Jon Udell was talking about screencasts again today, here's one I've been meaning to do for a while. This demonstrates a little bit of searching HubMed, exporting BibTeX data and adding it to a BibDesk library, autofiling and associating a PDF file, adding the citation to a TeX file, then formatting a bibliography.
Watch the movie (1'37", 8.7MB QuickTime). Made with Snapz Pro X and QuickTime Player Pro.
Update: re-recorded to make the process a bit clearer.