Ideal EULA for Custom Software?

Tiger4 asks: ""End User License Agreements (EULA) for custom developed software present a nasty problem for both developers and the customer. What rights does should the developer grant to the user, and what rights should be retained by the developer to capitalize on their effort? Similarly, the customer, who is paying for the work, wants all the rights possible to maximize their investment, but probably only needs a small subset of them, such as maintenance and upgrades. The developer probably wants to be able to re-use and resell chunks of the code; the customer doesn't want single source lock-in, so they want re-use and alteration rights too. The Open Source licenses don't solve all ills, because some processes and data may be trade secrets, or at least closely held in an industry. So what terms should definitely be in a EULA, to provide both maximum flexibility and protection for both developers and customers?"