Where can I find a big chess database? I am searching for a big chess games database, in PGN or CBH or SCID format.
ICOfY Base is no longer available, I think. I found nothing in torrent sites (I am searching for something that is legal).
I use the games published by The Week In Chess, which are published in a weekly basis. These games make a superb database, although maybe you'll miss some historical games. It takes some effort to build the database with all games published to the date, but from then on it's easy to keep it up to date.

It is also possible to download the Million Database and then to keep it up to date with TWIC games.