WordNet (r) 3.0 (2006):

in vogue
    adj 1: in the current fashion or style [syn: latest, a la
           mode(p), in style(p), in vogue(p), modish]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "in vogue":
   all the rage, all the thing, current, fashionable, hip, in fashion,
   in style, mod, modern, new, newfashioned, popular, prevalent,
   smart, trendy, up-to-date, up-to-datish, up-to-the-minute