Today the ARRL announced a new website to help anyone to prepare for getting their amateur radio license or upgrade, allowing them to take tests and track progress. See: ARRL Announces Free Exam Review Website. The site covers the technician, general and extra class exams.
Also, remember that a new technician class question pool goes into effect July 1st, 2014. The website covers both pools.
A link to the Exam Review website has been added as a resource on the SEARES site.