Here's one of the finest controllers ever made, the Atari 5200 Trak-Ball!
I got one of these a few years ago. It's absolutely awesome--it really feels like an arcade-quality controller, particularly with games like
Centipede. It even looks good, matching the sleek styling of the Atari 5200 console itself.
Some people who felt that the smaller buttons weren't truly arcade quality have made some modifications such as this one:
Note the extra (round) arcade-style button underneath the standard buttons on the left.
It's too bad there aren't any arcade-style trackballs on the market anymore--just little thumb balls (mostly used as a mouse substitute on laptops). There are a few fancy rigs like the
Devastator II, but these require quite an investment in money as well as storage space. One of my friends has one of these, and he likes it a lot. Here's a picture:
This review of the Devastator II from RetroBlast is worth reading (it's also where the above picture came from).
I'd like to see some trackballs for the newer consoles. The last ones that I recall that were mass-market items (not homemade controllers) were Nyko's Classic Trackball for the PlayStation and Mad Catz's Panther DC for Dreamcast. It would be great to be able to use a trackball with
Atari Anthology for either PS2 or X-Box. I suppose the Nyko Classic Trackball could be used on PS2, but support would have to be programmed into the game--
Midway Arcade Treasures contained a couple of games that could've really benefitted from trackball support, but that didn't happen.