Most of it isn't in the "arcade" area, so I dunno if it counts.
- Steve Ritchie signed Spider-Man blueprint
- Bruce Campbell signed Evil Dead movie poster
- Bruce Campbell signed chainsaw blade
- Keiji Inafune signed Mega Man 2 NES cart
- Keiji Inafune signed Lost Planet LE
- Hideo Kojima signed Snatcher
- Koji Igarashi signed Castlevania: Dracula X chronicles for PSP
- Diablo II signed by the entire Blizzard North dev team
I'm pretty sure I am missing some more stuff. By far the Snatcher, Mega Man 2 and the chainsaw blade were the most interesting moments when I got them signed.
I have:
Virtua Racing Sega Genesis cart - signed by Yu Suzuki
Shenmue for Dreamcast disk and cd cover - signed by Yu Suzuki
Sonic Adventure Dreamcast disk - signed by Yuji Naka
Samba De Amigo Dreamcast disk - signed by Yuji Naka
I always wanted to get something signed by Miyamoto but never got a chance ...
Yeah man! Yu Suzuki and Yuji Naka are two signatures I really want to snag (ShenMue or maybe a Space Harrier or Outrun marquee...for Naka I have a press kit from the original PSO title). I'd also love some of the Capcom artists like Akiman. I dig Miyamoto's stuff (who doesn't?), but I never really thought about what I would ever want him to sign.