Before I begin, let me state upfront that we do have a good background in Flash; ToonDoo, a great place to create & share comics – think of it as our humble contribution to global unproductivity – uses Flash heavily. In fact, it is hard to think of doing the comic design tools in ToonDoo without Flash. So, yes, we love Flash – our fanatics are better than your fanatics!
1. Native to the Web
I am sure Flash will eventually find a way to natively integrate with the browser but it is not there yet.
2. Open Source Library Support
3. Vector Graphics in Browsers
4. Mobile Support
Try any of the Zoho services. Try equivalent Flash applications. Compare the initial loading time. As broadband adoption spreads, this would matter less and less. But it still matters a lot today. In a country like India, where “broadband” has been redefined to mean as little as 128kbps (no kidding!) it really matters. Yes, it is only one time loading. Java Web Start said the same thing too.