When it comes to Web 2.0, it's all about the GUI, UX, UE, WYSIWYG, FTW, WTH*. Ok, ok, enough acronyms. Let's just leave things simple. "I saw this cool feature on another web site and I want that feature too."
Typically, the feature you're seeking to incorporate entails the use of AJAX or Javascript. While the cost for adding such features used to be quite high, the use of jQuery and its firm acceptance within Drupal make things much easier.
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