In my center panel, I have the widgets/icons that I use most:
Power Widget
Phone
Calendar Widget
Voice Dialer
Alarm Clock
Communications Folder consisting of Email, GV, Handcent, eBuddy, etc.
On the left panel, I have all my icons that I use regularly, but aren't essential to my day-to-day stuff:
Facebook
Dolphin Browser
Shopping folder: Where, Places Directory, Android Market
Media Folder: Camera, Gallery, Pandora, Music, etc.
Google maps
Games Folder
So on and so forth.
On my right panel, I have strictly 1-touch dialer short-cuts to the people I call the most & the Goog-411 widget
So I don't know where that puts me with the L/R brain here.