lol @ 14kh/s between blocks 0 and 1, that's obviously satoshi trying his hardest to mine for a week rather than him waiting for public release before mining.
Wrong. (you should stop posting now...)
The genesis block, Sat, 03 Jan 2009 18:15:05 GMT, had to be included in the c++ code before it was compiled. Then the code had to be tested and packaged before it was released. Bitcoin probably
was "premined" before release by some testing, but any blockchain testing was discarded. Satoshi appears to have had working near-Bitcoin code for quite a while (see quote above).
Since the genesis block also has an extranonce of "4" like the first block does, it is likely generated with the same Bitcoin mining code as in the client, and took no more effort to find than the first block (3-4 nonce cycles).
The freenode #bitcoin channel (now used for discussion) is where Bitcoin originally connected to find peers. It would be interesting if there are any logs of how early this channel first appeared to see pre-release testing activity.