Astronauts from Atlantis and onboard the International Space Station managed to get 4 of the 6 control computers back up and running. They are slowly giving them more tasks to take care of and from what I've heard they expect things to be back up to speed very soon. The other two computers are fried and will need to be replaced.
What caused all this woe? They still aren't sure. MSNBC has more in a surprisingly complete article.