PostgreSQL, MySQL, & Oracle job trends

It appears that the number of jobs for PostgreSQL and MySQL are increasing at a fast rate, especially when compared to Oracle!

I am keep find reviews about PostgreSQL 9.0, and they overwhelming show how superior PostgreSQL is compared to MySQL in terms of both performance and reliability amongst other things. Also it seems that for some work loads, even at the enterprise level, PostgreSQL holds its own compared to Oracle in terms of performance. One company claims to have done hundreds of conversions from Oracle to PostgreSQL (presumably prior to PostgreSQL 9.0!).