It would be cool to have two new grove components.
For pressure, the BMP085 is a good choice. That means you can get accurate atmospheric pressures either for a barometer or for an altimeter.
For measuring both airspeed, and in the case of gliders, total energy, a differential pressure sensor is needed MPXV7002DP is a component.
store.diydrones.com/product_p/br-0002-10.htm
store.diydrones.com/product_p/br-0011-01.htm
For examples.