Can you use a Mouse and keyboard for ps3 games?

First of all I don't want to spark a OMG Mouse and Keyboard would be too unfair Topic.

Me personally i just want to know if you can use it for FPS games I play more PC games then Console *saying i do most of my Online gaming on pc* and would prefer to use a mouse and keyboard because I'm more comfortable using them.

And if you can would it be Just Plug and play type of deal or do i need to download some sort of software?

As of today, the only PS3 game that supports kb/m for gameplay is Unreal Tournament 3. A few other games support a keyboard, but only for texting in lobbies and a few other things.

I honestly don't see that many games in the future adding support for kb/m, so it's going to come down to you either just getting used to the controller or you look into and invest in something called the FragFX.