Today on March 15th 2010, GATE 2010 results will be declared at 10 in the morning. You can check it online on all the 7 IIT websites and IISc websites, you can also see the results being displayed at the GATE offices.
You can keep the GATE scores for the next 2 years as they will be valid for the 2 year period. Other than getting the admissions to IIT and IISc many organizations, educational institutions also treat this GATE score as a valid way to measure for higher education courses or jobs.
GATE 2010 was organized by IIT Guwahati and you check the results at http://www.gate.iitb.ac.in/gate2010_website/results.php