The Collaborative International Dictionary of English v.0.48:

Agog \A*gog"\, a. & adv. [Cf. F. gogue fun, perhaps of Celtic
   origin.]
   In eager desire; eager; astir.
   [1913 Webster]

         All agog to dash through thick and thin. --Cowper.
   [1913 Webster]

WordNet (r) 3.0 (2006):

agog
    adj 1: highly excited

Moby Thesaurus II by Grady Ward, 1.0:

184 Moby Thesaurus words for "agog":
   advertent, agape, aghast, alacritous, alert, all agog, all ears,
   all eyes, amazed, animated, anticipant, anticipating, anticipative,
   anticipatory, anxious, aquiver, ardent, aroused, assiduous,
   astonished, astounded, at gaze, athirst, atingle, attentive,
   atwitter, avid, awaiting, aware, awed, awestruck, beguiled,
   bewildered, bewitched, breathless, burning with curiosity,
   bursting, bursting to, captivated, careful, carried away, certain,
   concentrated, confident, confounded, conscious,
   consumed with curiosity, curious, desirous, diligent, dumbfounded,
   dumbstruck, eager, earnest, ebullient, effervescent, enchanted,
   enraptured, enravished, enthralled, enthusiastic, entranced,
   excited, exhilarated, expectant, expecting, fascinated, finical,
   finicking, finicky, fired, flabbergasted, forearmed, forestalling,
   forewarned, forward, full of life, galvanized, gaping, gauping,
   gazing, ghoulish, gossipy, heedful, high, hopeful, hopped up,
   hypnotized, impassioned, impatient, in anticipation, in awe,
   in awe of, in expectation, inflamed, inquiring, inquisitive,
   intense, intent, intentive, interested, itchy, keen, keyed up,
   lathered up, lively, looking for, looking forward to,
   lost in wonder, manic, marveling, mesmerized, meticulous, mindful,
   morbid, morbidly curious, moved, nice, niggling, not surprised,
   observant, observing, on the ball, on the job, open-eared,
   open-eyed, openmouthed, optimistic, overcurious, overwhelmed,
   panting, popeyed, prepared, prompt, prurient, puzzled, quick,
   quizzical, rapt in wonder, raring to, ready, ready and willing,
   ready to burst, regardful, restive, roused, sanguine, scopophiliac,
   spellbound, spirited, staggered, staring, steamed up, stimulated,
   stirred, stirred up, stupefied, supercurious, sure, surprised,
   thirsty, thrilled, thunderstruck, tingling, tingly, turned-on,
   under a charm, unsurprised, vital, vivacious, vivid, voyeuristic,
   waiting, waiting for, watchful, watching for, whipped up,
   wide-eyed, wonder-struck, wondering, worked up, wrought up, yeasty,
   zestful