Good point Tracy ...
In regard to MySQL ... we don't link to the "Why not MySQL?" page on our site any more. We've kept it around for historical reasons only. Google finds it ... but there's a bold disclaimer at the top saying THIS IS OUT OF DATE.
We really don't get too many people asking for MySQL support any more. PostgreSQL, while not as popular as MySQL, has a great deal of credibility in the Open Source world.
We don't see as much demand for SQL Server, either, these days, not like we did two years ago.
My estimate is that adding a third database to the mix would increase our development, maintenance and documentation effort by about 25%. As it is we've been unable to keep our two databases in lockstep ... there are contrib packages that support one or the other but not both RDBMS's.
