Try reading the responses to my 'obsessed' thread and you will be so uplifted by how many caring and dedictated teachers there are out there to support you!! Coming here is a great source of inspiration for me in many ways.
As for during the school day, things will be a little bit harder. I have a second year teacher and a veteran (30 years!) who both compain equally and frequently to the other member of our team and I, and each other. Like you, I try to give them no reaction. Just 'un-huh' and 'yeah' and 'wow'. Sometimes I vent, too, because soemtimes it does make me feel better, but I have learned that your stress level and job satisfaction lie in your outlook.
Yes, the PE teacher didnt show up and you now have no planning time, but at least you'll have it the other 4 days this week! Yes, that child makes you repeat everything you say and still can't get it right, but you know he's a sweet kid who would never disrespect you intentionally (and some kids would!). There are so many good things about my job, I just try not to complain too much because I know I've got it good in many ways.
Try to stay out of their classrooms and make friends with other staff members. When they come to you and complain, keep working on whatever it was you were doing, grading papers, cutting something out, straightening desks. At least you will not be wasting your own time while they waste theirs complaining! I have found that I only get resentful of all the b**ching and moaning if it keeps me from getting my own work done.
You're going to get a lot of posts about this one, because it hasn't been discussed in a while and really hits home for too many people (unfortunately). Keep checking back...