I've gotten a huge response to the article I posted a few months ago about surviving an unhappy workplace.
Having been in the position myself several times, I'd like to offer some personal advice of how I dealt with the situation and maintained my sanity. There are really only two choices, stay and make the best of it or quit.
If you are going to make the best of it, walk into work with a good attitude in the morning and a smile on your face. Develop relationships with your colleagues. Don't sweat the small stuff and laugh during the day. Your there more than enough hours, your entitled to a laugh or two. If you find yourself getting aggravated or upset - take a break and figure out what works best for you to calm yourself down. Throw yourself into your work. Make that commitment to give a 110% and be the best at what you do.
Now if you can't do those things - its really time to look for a new job. When people start looking for a new job because they are unhappy, suddenly work becomes more bearable and even enjoyable. It's because you know that there are other options out there and you don't need to feel that you are stuck in your current situation. There is a light at the end of the tunnel. And if things do change at work and you start to enjoy it and decide to stay - at the very least you'll have an updated resume and have made some valuable contacts.