Found this great piece on agentgenius.com today and just had to share it with you. Personally, I've had a few really good pieces of advice through the years. Some of the best were:
1. Underpromise and overdeliver. (On the linked list too.)
2. Be yourself; don't compromise who you are for the sake of a deal.
3. This one's a little more greed oriented but it's still always stuck with me: Everyone you see walking down the street has $50 in their pocket that belongs to you. Your job is to try to get them to give it to you.
There have been many more, but I'd like to hear yours. What's the best business advice you've ever received?