What is TYPO3?
A free, feature rich, Content Management Framework built with PHP and running under many Unixes and Windows. The complete feature list is available at typo3.com.

Is learning how to program in TYPO3 for me ?
If you were impressed by the feature list you're probably asking yourself if this product is for you? Be aware that all the flexibility and richness come with a price: complexity. If you're not ready to spend a year learning the system and are in a hurry to satisfy a customer, you should probably look into getting somebody to help you or look for a different web solution.

TYPO3 is an enormous and capable system and it cannot be fully learned in a week! TYPO3 will always have a long learning curve for developers. Once mastered, the system will let you develop the most complex website and the authors using it will love you for the choice of TYPO3. However as a user, TYPO3 is very easy to learn it usually only takes half an hour to understand how to change text and pictures and add and delete pages.