Satoshi announced the version 0.3
11 years ago, which was when the thing was starting being taken more seriously. The main addition in that version was the RPC; the previous ones (I think they were only two?) didn't have any command line interface. It was just the “Bitcoin” GUI program with a “Generate Coins” menu tab and an input field for the payment.
I noticed that he also made hashing 20% faster, possibly for mining. Is there any purpose why one should do that? It doesn't matter the amount of hashes a miner generates, but the distribution of those among the miners, right? The distribution would remain the same with or without faster hashing.