Note:  For a minority of users, the bootstrap.dat "one huge 20GB file" import method does not work beyond 4GB of data.  This is due to some limitations with large files on some 32-bit operating systems.  It is planned to move away from a single bootstrap.dat file to a directory full of blkNNNNN.dat files that may be imported directly into bitcoind via "-reindex".  The bootstrap.dat file also causes a 2x disk space increase over the "-reindex" method, which occasionally triggers complaints from users on low disk space cloud servers.

For these reasons, bootstrap.dat import method is being deprecated (at least with regards to this torrent).  Today's torrent update will be the last bootstrap.dat torrent.

Future torrents will include the block chain split into multiple files, never exceeding 1GB in size.