August 29, 2008 9:08am by Steve | 
Just found this funny bit of text in the Adobe Flex 3 docs regarding form validation. These 2 paragraphs appear in this exact order in the docs:
By using Flex validators, you eliminate the need to transmit data to and receive error messages back from the server, which improves the overall responsiveness of your application.
Note: Flex validators do not eliminate the need to perform data validation on the server, but provide a mechanism for improving performance by performing some data validation on the client.
Wait, so did I just “eliminate the need” or not? 
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Nope, you didn’t. In reality you have no idea what happens to the data between "Client side" validation and it hitting the server.
In many ‘normal’ situations, you can get away with doing one or the other; but when the hackers come running, you can get screwed very quickly if you’re not doing it server side.