How to transfer only the blockchain to a friend's computer? After installing the bitcoin client (Qt) a friend got interested as well. He doesn't have as fast an internet connection, though, so I thought of burning some DVDs with the blockchains for him to have.

I saw this question on how to transfer blockchain from PC to Mac and the solution was to copy the whole "Bitcoin" folder. However, that folder also contains MY wallet as well (which I definitely do not want my friend to have, even if encrypted).

So I'd like to know, which folder(s) and/or files do I need to copy, minimally, so he needs to get as few blocks over the network as possible?
If it's too much of a hassle, most probably I'll suggest him to use multibit or electrum instead :-)
Transfer everything except wallet.dat and the database folder.