Playstation 3 Accessories?

Hey everyone,

I've had a PlayStation 3 for a few months now and I have a nice collection of games as well as some BluRay movies. I'm going to be getting Battlefield 3 in the coming weeks to complement my collection and I was wondering what accessories would be good for BF3 as well as any other games.

I have absolutely nothing in addition to the original package, which was a PS3 (slim) and a controller.

So my question to PS3 owners is: What can you not live without when using your PS3?

A headset? The remote for movies? Controllers?