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Summary: AJAX, rich Internet UIs, mashups, communities, and user-generated content often add more complexity than they're worth. If you focus on over-hyped technology developments, you risk diverting resources from the high-ROI design issues that really matter to your users — and to your profits.
They also divert design resources and prove (once again) that what's hyped is rarely what's most profitable. Unlike some older technologies (notably, Flash and PDF ), Web 2.0 ideas are not be highly effective; we sometimes see examples of usability-enhancing Web 2.0 designs in our studies.
It's deadly for e-commerce sites when users can't operate the shopping cart, so it's usually best to stick to simple shopping-cart designs that everybody understands.
To get the required response times, spend your money on bigger servers and better hosting providers.
Web 2.0 is the term given to describe a second generation of the World Wide Web that is focused on the ability for people to collaborate and share information online.