Yeah I had a little bit of a traffic drop too, this is the first Google update that has effected me negatively
. It sucks because I spent the last month really churning out blog after blog and had gained lots of traffic and now some of it's gone.
BUT, just watch it for a week or so...I find that after a couple of weeks the traffic usually evens out from the updates and goes back to normal. It's hard to see exactly what effect it has had until after a little bit of time has passed and the rankings settle down.