Spybotics

Over on the Lego site, there's a tactical combat game called Spybotics: The Nightfall Incident that is surprisingly deep from both a gameplay and a story perspective, and also very polished.

The gameplay hinges on using programs to hack into network nodes, using each program's strengths to gain different advantages on the battlefield. The storyline, even early on, brings in a mystery of sorts, where you don't know who to trust, despite the simple yes/no dialogue interface. For a promotional online game aimed at kids, the game creators really pulled out all the stops. Pretty impressive.