Heehee, the idea of Notch not blurting out secrets makes me giggle. Maybe that's why they don't want to use NDAs anymore
I've had to sign a few NDAs in the past (game testing/moderation work) and also been involved in alpha/closed beta testing where not discussing game details was merely an 'understanding' you entered into when you started testing. It didn't seem to make any difference to keeping secrets. People who are stupid enough to discuss games in closed testing did so anyway, and the rest of us kept our mouths shut regardless of whether anything was signed.
Trowzers- pretty much everywhere.
Currently hooked on - Minecraft, Glitch, Botanicula, Dungeons of Dredmor, Dwarf Fortress...