I use Oracle, but we're moving away from it. Licensing fees per CPU when our trend is to throw smaller redundant CPUs at a problem means that if we just heap fast drives and RAM on top of MySQL or Postgres, or even SQL-lite, we can get similar results. I've been exceedingly vocal in moving all our old services (Broadvision, Solaris, HPUX, etc) to Open Source solutions and Oracle is the last hurdle. Sure, we lose some functionality, but we can do that cheaper on the application server. Fun stuff.