From Adam Lee's Daylight Atheism blog his "ten commandments".
First Commandment: Do not do to others what you would not want them to do to you.
Second Commandment: In all things, strive to cause no harm.
Third Commandment: Treat your fellow human beings, your fellow living things, and the world in general with love, honesty, faithfulness and respect.
Fourth Commandment: Do not overlook evil or shrink from administering justice, but always be ready to forgive wrongdoing freely admitted and honestly regretted.
Fifth Commandment: Live life with a sense of joy and wonder.
Sixth Commandment: Always seek to be learning something new.
Seventh Commandment: Test all things; always check your ideas against the facts, and be ready to discard even a cherished belief if it does not conform to them.
Eighth Commandment: Never seek to censor or cut yourself off from dissent; always respect the right of others to disagree with you.
Ninth Commandment: Form independent opinions on the basis of your own reason and experience; do not allow yourself to be led blindly by others.
Tenth Commandment: Question everything. (Including these commandments.)