That's great.  I just hope my block serialization is identical to the format in the file!   I know my headers are... I guess this will be a good test for whether all my serialization code works.

The one last question I have is:  if blk0001.dat has all the block data, what does blkindex.dat hold?  I would guess it's just headers, but there should only be 12 MB worth of headers.  What I downloaded has 170MB.

-Eto