The features are unparalleled, and it's free for friends of AnimSchool! (some restrictions apply).
AnimSchool Picker is tightly integrated into Maya, highlighting when you make a selection in Maya, as well as picking from the buttons.
Users can zoom and pan using standard Maya navigation hotkeys.
Authoring a picker is very easy. Make single or multiple object buttons--even vertices. Make script/command buttons. Move buttons or groups of buttons with the control key. Nudge buttons precisely with the arrow keys. Arrange and distribute buttons horizontally or vertically.
Reuse pickers in an instant by switching it to another character's namespace. AnimSchool Picker automatically changes all buttons and scripts to update to the new character.
The AnimSchool Picker will be released late first quarter of 2013 for Maya versions 2011+, PC and Mac. Softimage version likely to follow.
The AnimSchool Picker is offered with restrictions similar to the Malcolm rig: free for most uses outside of online instruction similar to AnimSchool.
Look for more details soon, including a video tour.