The whole thing, in one big SCID file set (about 300 MB):
ftp://cap.connx.com/pub/Scid/junkbase.sg3.bz2
ftp://cap.connx.com/pub/Scid/junkbase.si3.bz2
ftp://cap.connx.com/pub/Scid/junkbase.sn3.bz2
The individual compressed PGN files are here (sorted by ECO):
ftp://cap.connx.com/pub/a-openings/
ftp://cap.connx.com/pub/b-openings/
ftp://cap.connx.com/pub/c-openings/
ftp://cap.connx.com/pub/d-openings/
ftp://cap.connx.com/pub/e-openings/
A bit over 3.5 million games. Filtered for Duplicates by Pgn-extract, then
Chess Assistant, then Scid (two cycles each program filtering).
Still a lot of crappy stuff in there. But hey, free chess games.