Or its boring, corporate parent got bored of its fun, little, upstart adopted child. I can't read press releases of this kind without thinking "soulless corporate decision based just on money". Maybe Hipmunk was making $$ but the corporate parent wanted it to make $$$.

Too bad. Hipmunk had a lovely UI and was very useful. I hate how acquisitions (and acquihires in particular) cannibalize and destroy awesome little products.