Wow. I hadn't seen one of those in forever.
I had one back in the day to play Descent. It was the perfect controller for that. Used to fiddle with it in Quake, but that really wasn't the proper place for it.
I've got one of their current products the "Space Navigator" (they've rebranded as '3dconnexion' but it's essentially the same company)
http://www.3dconnexion.com/products/spacenavigator.htmlI do a lot of CAD work, and I swear by it. Google Earth is tons of fun with it as well.
As for the old SpaceOrb, converting it to USB would be a neat little hack.... but now as it was then "What exactly are you going to play with it?"
Descent was the only game that it really lent itself to perfectly. I suppose the game "Forsaken" would have too, but that was essentially a Descent rehash in an apocalyptic earth setting.
Edit: Wow, reading that article is really making me pine for the days when I had one.. Damn i should have never sold it.