You might be surprised about the number of database "experts" who have never heard of Postgres. They know about MySQL because Slashdot uses it, and they vaguely know about Access, tho' they've never used it and don't know what it's good for.

Sharding, for instance, is a hot topic right now but "big iron" DBAs like myself are completely mystified... Isn't this just the partitioning/shared nothing feature that we've had for over a decade? (Answer: yes of course it is).