Hitec Waterproof Servos
Hitec quite possibly wins the best product demonstration of the IHobby Expo. Their new(ish) waterproof servos, the HS-5646WP and HS-5086WP, were operating during the entire run of the show completely submerged. The HS-5646WP is capable of nearly 100 oz/in of torque at a speed of .26 sec/60°, while the HS-5086WP is able to do about 40 oz/in at .18 sec/60º. List prices for these are apparently $79.95 for the big one and $73.95 for the small fry.
Keep an eye on the Hitec web site for more info when they get around to putting it up there.