What's Up? Space Probes!

Space exploration has never been busier. This list doesn't include projects studying the Earth in particular ("Earth probes?"). And it leaves out the Shuttle and the International Space Station.

Mission Name	Objective	Sponsors
Advanced Composition Explorer (ACE)	Particle sensor	NASA
Cassini/Huygens	Saturn and its moons	NASA, ESA
Chandra	X-ray observatory	NASA
Cluster	Study magnetosphere	ESA/NASA
Deep Impact	Comet rendezvous	NASA
DoubleStar	Magnetosphere, with Cluster	ESA, CNSA
Galaxy Evolution Explorer (GALEX)	UV observatory	NASA
Gravity Probe B	Test general relativity	NASA/Stanford
Hayabusa	Asteroid sample return	JAXA
Hubble	Telescope	NASA
Integral	Gamma-ray observatory	ESA
Mars Explorer Rovers	Mars surface exploration	NASA
Mars Express	Mars imaging, radar, spectroscopy	ESA
Mars Global Surveyor	Mars imaging	NASA
Mars Odyssey	Mars imaging	NASA
MESSENGER	Mercury exploration	NASA/Johns Hopkins
Rosetta	Comet rendezvous	ESA
SMART-1	Lunar analysis, ion drive	ESA, ESTEC, SNECMA
SOHO	Solar observatory	ESA/NASA
Spitzer	Infra-red telescope	NASA JPL
Stardust	Comet sample return	NASA JPL
Swift	Gamma-ray observatory	NASA
Ulysses	Polar solar observatory	ESA/NASA
Voyager 1 and 2	Interstellar probes	NASA JPL
Wilkinson Microwave Anisotropy Probe	Microwave observatory	NASA
XMM Newton	X-ray observatory	ESA

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Links to space agency sites:
NASA
ESA
JPL
CNSA
JAXA

I will try to update this list from time to time. Email me if you think it is getting out of date, or if I missed anything.