These are obvious, but you can never get enough good advice, right?
Show appreciation - thanking people for their assistance is not only the right thing to do it is expected.
Listen effectively - think before speaking. Listen attentively. Make the person feel like they are the only thing you are focusing on.
Give credit to others - always give credit where credit is due.
Don't be negative - negative people can kill team creativity. Eliminate them from your team if possible.
Have a work/life balance - don't forget that all work and no play makes for a dull life.
Don't have hidden agendas - they are only hidden for a while, and most people realize what you are doing.
Be willing to publicly admit your failures - there is nothing more pathetic than the person that never admits a mistake.
Talk about the problem not the person - don't personalize problems and make them about a person or group. Be willing to focus on only on the problem.
If you lie down with dogs you will get fleas - be careful of your relationships in the workplace. Trust, but verify.
Don't gossip - gossip can hurt careers and projects. Don't participate in gossip and don't allow it on your team.
Use Empathy not Sympathy when dealing with delicate issues - Empathic listening is listening with intent to understand. Sympathetic listening is a form of agreement and judgement.
Diagnose before your prescribe - if people don't have confidence in your diagnosis, they won't have confidence in your prescription
Keep your commitments and promises - enough said.
Remember while you are free to choose your actions, you aren't free to choose the consequence of those actions.