I'd be very wary of Geelong in the coming weeks. After a few games where they didn't really do much until half-time, and last week, where they were molested by Collingwood, it will force them to look at their weaknesses, which they wouldn't have really been concentrating on, since they were undefeated for like... a year.
It may not be this week, but they'll most likely be back to typical Geelong form in a couple of weeks. It's always good for a really dominant team to lose a mathc, usually makes them better. I mean, in 2001-03 (plus '04 Grand Finalists), when Brisbane were clearly miles ahead of anyone else, not once did they finish on top of the ladder, yet they still went on to win three in a row, plus get owned in the 2004 Grand Final.