The Dacta Micro Building Set 9324 is another official LEGO set in microscale. Dacta sets are aimed at the educational market. They are sold through LEGO Education rather than through regular LEGO retail outlets.
The set comes with 1,641 pieces and 8 themed idea cards. I've found that the cards are a great way to introduce students to the concept of microscale building. Each card shows a micro scene (farm, castle, airport, etc.) and gives detailed instructions for two or three of the items featured in the scene.