NASA develops new satellites and rockets on a somewhat regular basis, however if you're referring to MANNED spacecraft then the answer would be the Ares I Rocket. NASA is going back to rockets after the shuttle program because they are cheaper and easier to produce than shuttles. While the Ares project is currently suspended indefinitely, the Orion Space Exploration Vehicle is one of only two prospective manned spacecraft candidates which could qualify as a potential next-in-line to the shuttle at this time. The Space Launch System (SLS) which replaced the planned Ares rocketsis a more likely possibility, however details are very vague in this early stage of development.
The New Horizons spacecraft. It will reach Pluto July 14th 2015.
NASA
NASA's Pioneer 10 spacecraft.
The first maneuverable spacecraft is considered to be the Gemini Spacecraft. This was NASA's second human spacecraft, and its mission lasted from 1965 to 1966.
The space shuttle.
Redstone.
Nope, it returned to NASA
Orion capsule
NASA
None, but in 2015 NASA's New Horizon will travel to Pluto and will be the first spacecraft to land on Pluto.
The first spacecraft to land successfully on Mars was Viking 1 in 1975
Nasa space shuttle