More recent missions to Mars include the hugely successful Mars Pathfinder, which landed a small `rover' called Sojourner on the surface to explore a region where there may once have been life. Sojourner has now been effectively switched off, but lasted almost twelve times its expected lifetime. Similarly the lander, which imaged several areas around the landing site (dubbed the Carl Sagan Memorial site) and took atmospheric measurements, lasted a good deal longer than expected. The only unfortunate thing to have arisen from the mission is the naming of the rocks at the landing site (including everything from Scooby Doo to Darth Vader)!You can find out more about Mars Pathfinder from:
http://mpfwww.jpl.nasa.gov/

Mars Global Surveyor (MGS) is at Mars and collecting data right now! It has already sent back some of the most awsome images of Mars ever seen. You can find out more about the Mars Global Surveyor from:
http://mars.jpl.nasa.gov/mgs/

There are now scheduled three missions to be launched every two years in a joint US/Soviet project to learn more about our neighbour in space. The spacecraft that is travelling to Mars at the moment is called Mars Odyssey 2001. You can find out more about these current and future missions from:
http://marsweb.jpl.nasa.gov/

It is not just the American's who are interested in Mars! You can find out more about the Japanese Mission Nozomi: Planet B from:
http://www.planet-b.isas.ac.jp/index-e.html

And you can find out more about the European Mission Mars Express from:
http://sci.esa.int/marsexpress/