I loved it. It's my new favorite kid movie! It basically destroys the stereotypes of the main holiday characters in an awesome way...Autralian easter bunny, russian santa, mute sandman, and a bird tooth fairy. Jack Frost is my favorite though - Totally fell for him.
I went to see it a couple weeks ago, and really liked it. Only real issues I had were that it sort of blatantly pushes the commercial holidays, and then the whole light=good, dark=bad thing, but other than that, it was pretty awesome. Worth seeing definitely!!!