I'm designing a new desk for myself, with modular units for the
"pedestals". Each side of the desk will have one or more of these of
various widths. Each is a separate box (sides, back, bottom) made from
1/2in plywood with hardwood fronts (face frame, drawer front,
whatever, not shown in photo). I'm wondering... what would be the best
joinery to use to assemble the plywood box part - rabbet+glue?
biscuits? lock miter? pocket screws? something else? a combination of
the above?

Photo, details, and sketchup file: http://www.delorie.com/wood/desk/module.html