MySQL AB never announces these things properly, so for those who are interested there is a new version of MySQL out, namely 4.04. Ironically, 404 errors is what I got when I tried to download it, as from their dozens of mirrors I could only find one, so I’m assuming this is hot off the presses. From the tests I’ve run so far there seems to be a very marginal speed increase over 4.02, but it doesn’t seem to have any of the terrible bugs that 4.03 had. 4.03 really should have never been released to the public. I found all the files I needed here.