BOX4BLOX LEGO Organizer

BOX4BLOX is a filtering and storage system for LEGO (TM) and other similar brick toys.  It works by simply sorting the bricks through a series of trays with different sized grids, which means the blocks end up in a tray with similar sized blocks.

There are three filtering trays and one bottom tray.  Bricks can be easily found from the individual trays, especially those hard-to-find little bits and pieces that end up at the bottom.

A video of the mechanism can be seen below:

Source: BOX4BLOX