As far as I can tell, the advantages of using a RIA (rich internet application) toolkit are: * easier to develop desktop-like web applications * more straight

As far as I can tell, the advantages of using a RIA (rich internet application) toolkit are: * easier to develop desktop-like web applications * more straightforward to avoid duplicating client-side and server-side logic and the disadvantages are * your page tends to load significantly slower * your page isn't accessible to people browsing without javascript or disabled folks * you'll still have to generate html for googlebot, etc. Things I'm not sure about: * difference in development time * whether it's equally easy to integrate real-time functionality when you're using a RIA toolkit What did I miss? (other examples of RIA toolkits are http://www.sproutcore.com/ http://www.sproutcore.com/ and http://cappuccino.org/ http://cappuccino.org/. SproutCore is notable for supporting mobile devices unusually well, so I guess that might be a point in its favor?)