This folder will be about 12GB currently, and is always growing in size as the blockchain grows from use.
You can remove blk0001.dat, blk0002.dat, blk0003.dat and blkindex.dat from the root data directory after a reindex from installation of 0.8.0+ is complete and you are caught up with the blockchain (and you don't plan on going back to an older version).
Thank you so much! That's just what I was looking for. Removed those files, and I'm setting at 11.9GB. I initially installed 0.7.8, and have updated a few times since. I'm using 0.8.5 now, so should be all set. You can remove blk0001.dat, blk0002.dat, blk0003.dat and blkindex.dat from the root data directory after a reindex from installation of 0.8.0+ is complete and you are caught up with the blockchain (and you don't plan on going back to an older version).
