In the data path, I have files blk0001.dat 2 & 3 and blkindex.dat
all with date/time stamps of before I upgraded to v0.8.1
and it's data looks like it's all in a sub folder \blocks\  all have date/times of after I upgraded.

They're taking up 6gb of HD space, so if they're not needed for v0.8, it shouldn't matter if they're deleted?