I think there are a lot of good stuff to be found in this collection:
http://www.exeterchessclub.org.uk/Canon/canonidx.html
There used to be a neat (and free!) PGN-reader available called "ChessPad" in case you need a tool to work with the PGN-files.
I would like to know sources of good, high-quality games. Master level, if at all possible. I have a keen interest in Capablanca and Korchnoi, although any sufficiently large collection would do. If free, great ! If not, I would like to know the cost. A low rate of errors would be a high priority. As I have not yet purhcased any db software besides Bookup/COW, format does not matter quite so much... still checking out Chessbase, and Aquarium looks rather interesting - obviously PGN would be nice, but not critical. Any ideas ?