I'd encourage those with negative preconceptions about Flash UI to withhold judgement. That platform has been radically upgraded and we're probably just a few months away from seeing a wave of web applications with very nice Flash-based user interfaces.

Granted AJAX has the lead currently, and is more a standards track approach. The drawbacks to AJAX are the development resources required and user-agent (browser) compliance issues.

Developing to the AJAX target currently requires pretty top drawer skills in a number of departments: XML, CSS, Javascript, DOM, DHTML, etc. Tools are certainly coming along, but it's hardly an operation for the meek at this point. Flash is proprietary, but the proprietary owners have gone to the trouble of creating some pretty nice tools.

As for user-agents, well, AJAX is still basically DHTML and that means much suffering over browser compliance. Flash apps have the advantage of being able to update their container (the Flash engine) pretty much seamlessly.

And there are going to be other candidates in the not-HTML, rich-client-over-the-web technology runoff. Like XUL. And that other XULish thing coming from Redmond.

For another nice demo of some Flash rich-client UI, get yerself a test account here:
<http://www.laszlomail.com/lzmail/>

It's a full webmail client, and pretty darn slick. Made with OpenLazlo, an open-source toolkit for producing Flash-based rich client apps.

--rt


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