The LDO board or "Low Drop Out" board is essentially a break out board for linear regulators. It supports both TO-92 and TO-220 packages, so for lower current draw applications, the MCP1702 linear regulator can be placed, but for heavier loads, something like the TC1262 can be used. There's also a standard barrel jack on the board for power entry. The board works nicely with the Platform Board.
More information can be found at http://www.kevindarrah.com/wiki/index.php?title=Ldoboard