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No less than four different probe missions will arrive at/around Mars in the next six months (if everything goes according to plan).
The ESA's Mars Express was launched on June 2, 2003, and has an estimated arrival date of December 25, 2003.
The Japanese Nozomi probe was launched in 1998, and should arrive in January 2004.
The US has two rovers en route: Spirit was launched on June 10th, with an estimated arrival of January 4, 2004, and Opportunity was launched on July 7th, with an estimated arrival of January 25, 2004.