Those are nice too but this is the one I use actually...
http://www.amazon.ca/Kens...rackball/dp/B00009KH63 For some reason they call it the Expert Mouse even though it isn't anything like a mouse so I always forget the name. The ring around the ball is actually a scrollwheel and super handy. It's a little jerky scrolling in Sonar though which is weird but it works. The trackball action is free moving like an arcade golf machine style trackball (it actually just sits in the socket and if you turn it over the ball will fall out) which is the main reason I like it. If I swipe it it keeps spinning after I take my hand away. It's so sensitive and free moving that if I'm typing on my laptop on the other end of my desk the cursor on my big machine will drift from the vibrations.
Now the cool part for recording (I think) is the ginormous buttons. When I'm tracking I just leave the cursor over top of the record button in Sonar and poke the massive left button and I'm in. Hit the spacebar to stop and ctrl+z if I screw up. I've caught myself completely spaced out and doing this by reflex. It's like a little rhythm. Tap tap-tap CLICK... over and over again. The only time I have to actually fully put my hand on the trackball is if I like a take and I want to mute the lane but I know there's a keyboard shortcut for that too which I probably should learn. For mixing and tweaking parameters it is ridiculously precise (artists and engineers use these things and for good reason). And finally the best part is you can make HUGE gestures onscreen barely moving your hand at all... and THAT is why I hate mice. Hate 'em. Always bumping into crap on the desk, no precision and my big lanky hand turns into a tensed up claw after long usage.
Did I mention I hate mice?
And yeah, Beags... a lot of people can't stand trackballs because they are so used to mice. It used to crack me up when people at work or my friends came to my house would try to do something on my computers. The quizzical frustrated looks were priceless... but I'm kind of jerk like that. ;-)