Most general aviation aircraft require an annual inspection. Excluded are aircraft that:
Use an approved progressive inspection plan;
Carry a special flight permit;
Carry a current experimental certificate; or
Carry a provisional airworthiness certificate.
The annual must be completed and properly endorsed by a mechanic with an inspection authorization (IA) within the preceding 12 calendar months. For example, if the aircraft's annual is endorsed on March 15, 2012, the next annual is due before April 1, 2013; otherwise the aircraft may not be flown without authorization (such as with a ferry permit).
A ferry permit is required to fly an aircraft that's out of annual, such as in the case of flying to another airport for the inspection. Contact your local FSDO for instructions on applying for a ferry permit.