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or the mini-firewire? (lol at all the companies giving the port their own name)

Aren't they used for the camera?
 
The accessories I have are the EyeToy camera and the Karaoke Revolution mic, both of which work on your Mac.

You can also hook up a keyboard for certain games for text chatting. I know you could use it Metal Gear Solid 3: Subsistence, for example.
 
I believe there are, or are supposed to have been, a few games where you could connect two PS2s together using firewire and play multiplayer games. I believe Grand Turismo 3 has this capability.
 
Light Gun games use the USB port for the uh.. light gun attachment.
 
Keyboards, mice, printers, EyeToy, flash drives, headsets, microphones, force feedback steering wheels, charging stuff like your iPod or PSP (PSP if you have the right cable)

The mini FW port was used for linking together units. It was axed in the SCPH-50001 revision of the machine (Version 9)
 
I believe there are, or are supposed to have been, a few games where you could connect two PS2s together using firewire and play multiplayer games. I believe Grand Turismo 3 has this capability.

Yep, GT3 has this, and I actually even used it a couple times. It's a pain though, because you have to have 2 PS2s, 2 TVs, 2 copies of the game, and it's not all that much better than split screen really.
 
The accessories I have are the EyeToy camera and the Karaoke Revolution mic, both of which work on your Mac.

You can also hook up a keyboard for certain games for text chatting. I know you could use it Metal Gear Solid 3: clomid Subsistence, for example.

I used a k/b when playing SOCOM. I think also a mouse can be used as a pointer rather than the controller.
 
If you're not streaming/networked to your PS3 through ethernet or WiFi, it's a great way to transfer files from a computer to your PS3 -- via USB flashdrive/ jumpdrive (movies, music, photos, etc.)
 
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