A simple checklist, such as the one here, can help you make certain that you're not overlooking any important items associated with the product release. Feel free to add or remove items, or to phrase the questions differently, as required for your environment.
• Product: <insert name>
• Version: <x.y.z build>
• FCS Date: <FCS = first customer shipment>
• Are version strings updated with the final version information?
• Is all debugging and test code removed from the software?
• Are all seeded defects removed from the software?
• Is the final disposition and/or resolution of all defects complete? (No bugs with a status of open, ...