At this point, you should be ready to launch. Of course, the store owner or administrator may still need to add more products and content, but from a developer's point of view, if you have completed the steps in this checklist, your initial work is done.
We would like to add one more item to the list, though: test. Test, test, test, and test again. Before you go live, have the store administrator, any backend users, and your colleagues go through all possible scenarios. Store owners are always eager to launch — usually yesterday — but you cannot overdo thorough testing. It's always better to catch problems before launch than after.
As you've no doubt realized — and one great reason you bought this book — Magento is powerful ...