I would guess some of the accessories would be
-PS3 Bluetooth Wireless Controller
-Sony HDMI Cable
-PS3 Gaming Headset
-PS3 Rechargable Battery w/ charger
-PS3 Wireless Adapter (for $500 add on)
-PS3 External SD/Flash/Duo Card Reader (for add on if you got the $500)
-PS3 Replacement HDTV Cable
-PS3 Replacement S-Video Cable
-PS3 DVD Remote (or maybe a harmony type remote)