Your choice #1 must always be javascript. Why lock yourself to Adobe? I can state a very good example. One of the most widely used components in flash is the w

Your choice #1 must always be javascript. Why lock yourself to Adobe? I can state a very good example. One of the most widely used components in flash is the webservice component. An app i built in flash depends entirely on this component. But when the latest version of Flash, Flash cs3 came out, there is no webservice component in it! To rewrite my app in Actionscript 3, i must rebuild my app in Flash cs3. Now that this component in not included, its impossible to update my app.[This component is available in Flex, and Adobe can port that component to flash CS3 in no time. They are not doing it for obvious business reason] Bottomline is,building your business on top of any closed system is a bad idea. [Side note: Flex is not a big thing as Adobe markets it. Its Flash itself, but built to attract Java developers (developers who come from a background where Flash's timeline concept is unheard of). Flex need to be used ONLY if you cant find a decent actionscript developer. This is because, the only thing Flex does is to provide the developer with a lot of pre cooked UI elements.But by doing so, you will end up using a lot of unwanted code resulting in bloated file size.Do you really want to build a business on top of a very generalized component set? Reducing file size 300k to 10 k is good for you.Hire a decent local actionscript programmer if you have to go with Flash.]