-- check and double check your work.
-- return calls and emails promptly.
-- if you say you are sending a document, order, etc (yes, even to the other side), send it promptly. Follow through on your promises. If there are delays, let the recipient know why and when you will deliver.
-- don't overpromise.
-- if you don't know the answer, don't fib. It is ok to say you have to look into something.
-- yelling, cursing, and bullying don't usually help. In fact, if someone becomes obnoxious to me, I immediately go in my "you are getting nothing" mode.
-- keep clients and others informed of developments.
-- if you change documents, send redlines. Don't just say "we had a few minor changes." If you want us to sign off on something or pass along to our client, you got to show us what you did. We don't like surprises or sneak changes and it makes you look untrustworthy. Remember, even adversaries today can be clients tomorrow (job changes, referrals).
-- in the end, it is your reputation -- not your partners, not some other associate -- yours. Over the years, I have adopted the good traits of some fine mentors while recognizing that other traits were either not my style or not good for my reputation. Own your reputation. Remember -- and I know HP said this before -- no one is looking out for your career but you.