Dear Dan and Wes,
Although I've been a Postgres fan for a long time, I have not used any used oss DBs for some time. But as any good engineer should do so when making choices, could you please list some of the arguments in favour of the alternative, in this case MySQL? There has to be at least a few things if so many people go with it. Ie. the uber engineering blog has an entry why they switched back to my from post, but I'm sure there could be less complicated reasons.
Thanks for the show!