I adopted the free single member llc operating agreement from the link above with some modifications. The site provided good advise, common sense stuff that is worth repeating.
The way LLCs get pierced is if a single member LLC does not maintain true separation from the LLC. Meaning, if you are a single member LLC and pay for all your personal stuff out of the LLCs checking account, you are opening yourself up to a court determining that you and the LLC are the same entity. The single member LLC operating agreement could say some fancy things like allowing its members to pay for personal things out of the company checking account, but at the end of the day, that behavior will completely open you up to a judge deciding your fate.
The best way to protect yourself from the actions of a single member LLC is to keep everything completely separate.