The BGG XML snapshot is a compressed XML file in the same format as the XML API containing basic details and stats for all ranked games on BGG.
The most recent snapshot is from June 17, 2008.
It is available for download at http://files.boardgamegeek.com/snapshot/bgg-snapshot.xml.gz (deprecated)
Previous snapshots may be found at http://files.boardgamegeek.com/snapshot/ (deprecated)
Thoughts, comments, questions and suggestions regarding the snapshot are encouraged in the BGG XML Snapshot Discussion.
See also the BGG XML API