The developer is speaking about adding personal (node) blockchains in the next few months.  Then the main blockchain will only be for a kind of blockchain index (blkindex.dat?).  This is really interesting.  Bitcoin already has blk0001.dat, blk0002.dat blk0003.dat etc and the developer appears to be intent on modifying this system for Datacoin.  Nodes will choose which blk.dat files they wish to store.  There will be no main blockchain bloat, and it will only be metadata that will cost 0.05DTC per 128k.  Actual data stored in the node blockchains will be far cheaper.

I really like this developer.  He talks little but does much, comments it well and has great ideas.  He also seems to be very aware about issues with general data storage, like security.  He is setting up a system, not just a coin.

This is a very serious coin.  Ranked, I think, on the same level as Namecoin.  We should send the developer pull requests, and see what he makes of them.