Hi,
here are three Sega Dreamcast accessories that I couldn't locate in the database:
Accessory - Manufacturer - Region (Description)
Nexus 4 Meg Memory Card - EMS - Hong Kong (the same as the Nexus 16 Meg Memory Card but obviously with less memory; came in various colors)
DC-VGA Adaptor - Madness Gameware - USA (VGA Output; AV Output; S-Video Output; 2 headphone jacks; volume knob; and a switch for switching between PC Monitor/TV; transparent orange case)
Racing Wheel - Thrustmaster - Europe (Officially licensed Ferrari product; comes with steering wheel, pedals, and a clamping system for stability; has one slot on steering wheel unit for VMU/Rumblepack)
If you need any pictures for verification purposes, let me know.
-Speedy