Aspen Avionics AT300 is designed to be a drop-in replacement for a vertical speed indicator, but you'll get a lot more usable information in the cockpit when you couple it to your GPS; by Rick Lindstrom.
Pitch is not the only axis involved in making an airplane fly well. Yaw and roll are also important, and this month Barnaby Wainfan turns his attention to lateral/directional stability and its effect on flying qualities.