Best Game UIs

[econ21]

I am not sure if it counts as a UI, but I loved the Jagged Alliance 2 presentation of the strategic layer as a laptop, including checking your E-mails for missions and going to websites to buy weapons and mercs (and flowers for the Queen). The way the opening movie morphs into the strategic layer as your character opens his laptop was really neat.

[Sevis]

Generally, I'd say the less UI, the better. I'm very much happy to have to press an extra button to see the score, and have no problem at all with not knowing precisely how much ammo I have left. Penumbra managed this pretty well, Dark Messiah somewhat worse.