WordNet (r) 3.0 (2006):

overjoyed
    adj 1: extremely joyful

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "overjoyed":
   bursting with happiness, carried away, cock-a-hoop, delighted,
   ecstatic, elate, elated, enchanted, enraptured, enravished,
   entranced, euphoric, exalted, exultant, flushed, freaked out,
   happy, high, imparadised, in ecstasies, in heaven, in paradise,
   in raptures, in seventh heaven, jubilant, on cloud nine,
   overjoyful, possessed, rapt, raptured, rapturous, ravished,
   rhapsodic, sent, thrilled, tickled pink, transported