What DB drivers have you used?

This is in no way an official poll, but I've been wondering lately which of the 12+ database drivers people actually have used?

Unfortunately, there's too many items fro a poll, and that would only allow people to use a single one, so please list all drivers you have used in the past. Note that for many of the drivers there is now a PDO and non-PDO version so please specify.

Thanks!

I guess I should start it off. I've used mysql, mysqli, and sqlite in actual projects or development phases (all non-PDO). I've toyed with Postgres but haven't used it in a project yet.

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