Quite a few people have posted now saying that they seem to find blocks in quick succession.  I've noticed the same thing, but even to the point where different VPS's (same provider) have all found blocks within a minute of each other but nothing for hours either side.  In the last 4 hours I found 9 blocks all at the same time across 6 VPS's (around 30 mins ago), and then nothing for the 3 hours before that.  I have seen the same kind of patterns over the last few days too (though no normally 9 at the same time!).  Has anyone got any theories as to why this might be?