This is not strictly speaking a TeX question, but I think every TeX author will have been confronted by it at some point.
What convention do you follow when naming PDF copies of articles downloaded from the web?
I used to follow the same naming convention I used for BiBTeX entries, i.e. main author:year:title initials. For example, the "Go To Statement Considered Harmful" by Dijkstra (1968) would be saved as dijkstra:68:gtsch.pdf.
Now I'm not so happy about this convention because the colon, which was fine while I was working under Windows, is a reserved character under UNIX.
Corollary question: what convention do you follow for BiBTeX entries?