Other than the Mighty Mouse itself, that is, as I don't like their tactile "feel". Preferably with:
- USB interface
- OSX/Windows support
- 3+ buttons
Both use a wireless USB connection, and have the standard two buttons plus two programmable buttons on the side.
They are designed for Mac, but I've never had a mouse that won't work on Windows as well...
The small trackball on the Mighty Mouse is commonly referred to as a "scroll ball."
Genius - the first manufacturer to put a scroll wheel on a mouse - makes several corded USB mice which have scroll balls, three or more buttons and support for both Windows and Mac OS.
Some of the mice from the Genius product line which I anticipate will meet your requirements are the Ergo T555, Traveler 515, Navigator 525, Traveler 525 and the NetScroll T220.