It is strage indeed. mined 30 minutes before launch?
It was pre-mined 30mins before, ive said this already 100x no one listens :L
It's the genesis block, it needs to be mined before the official release (in fact, included in the source code itself), so that all the miners know where the chain starts.
Block 6 was the first accessible public block, as the official release had a checkpoint at block 5. It was mined at 12:32 AM:
http://catchain.info/block/e1817f9e0874e9356057c0eb2bba817bc461fdbbc105d4f167953f8d28437f61