Apart from NASAs Curiosity rover, 3 more missions are slated for launch to Mars in nov 2011; The ESA/NASA ExoMars orbiter, The Russian  GRUNT, and the Chinese Yinghou-1 orbiter

Phobos GRUNT
The Russian Phobos Sample Return Mission (also known as Phobos-Grunt) is scheduled to launch on a Zenit-2 rocket in November 2011 from Baikonur, Kazakhstan. The nominal timeline planned for the mission is as follows:

Nov. 2011 - Launch
Trajectory correction Maneuvers:
- Within 10 days after launch
- 80 days before arrival   
- 14 days before arrival
Oct.  9, 2012 - Arrival and orbit insertion at Mars i an initial orbit of 800 x 80000 km
- Orbit correction manueivers
- Separation of YH-1 Chinese orbiter
- Raise pericenter to approx 10000 km
Jan. 2013 - Lower apocenter to about 10000 km: Several months of observation of Phobos
Feb. 9, 2013 - Enter quasi-synchronous orbit close to Phobos (less than 60 km)
Feb. 2013 - Landing on Phobos
Feb.-Mar. 2013 - Liftoff from Phobos for return
Feb.-Mar. 2013 - Injection to Mars-Earth trajectory
Aug. 2014 - Arrival at Earth
- Entry and Landing on Earth

The total spacecraft weighs more than 13 tons and includes a large propulsion system for all the orbital maneuvers and the return to Earth as well as the large lander to operate on Phobos. The lander has a science payload of 50 kg with 15 instruments plus two manipulator systems to grab the sample(s) from Phobos.  The return capsule weighs 11 kg and the sample size is 200 grams.  This means that 13 tons will lift off from Earth to return an 11 kg capsule with 200 grams of Phobos!

The return capsule will also include our 89-gram LIFE module and two similar containers from the Russian Institute of Biological Medical Problems with different micro-organisms, that contains selected capsuled microorganisms, to  be returned to Earth. The purpose of the LIFE experiment is a "simulated space-rock"journey", to see if life could spread between planets in meteorites.

Yinghou-1
The Chinese Yinghuo-1 Mars orbiter weighs 115 kg and will piggyback on the PhSRM for insertion into 800 x 80000 km orbit at Mars. Yinghuo-1 will be delivered to Russia (NPO Lavochkin) in Dec. 2010.   The full PhSRM spacecraft will then undergo final assembly and tests in the first half of 2011, prior to delivery to the launch area in Sept 2011.

ExoMars
ESA and NASA will send a joint orbiter to Mars to look for bio-indicators. It also includes a European mini-lander, which is mainly a technology demonstrator for ESA.

Read more on:
ESA ExoMars mission
NASA Curiosity rover
Phobos GRUNT and Yinghou-1