While WordPress widgets are very easy to use, they are somewhat inflexible by default. The WordPress core doesn’t include any built-in options for easily changing conditions for where your widget should show up and where it should be hidden.
That’s why we always like to make our readers aware of new ways that they can add some flexibility to WordPress widgets. Flexible Widgets is a relatively new plugin that lets you display a widget on any category or page you wish.
After you install the plugin, all of your widgets will have an added set of display options:

Select the categories and/or pages where you want to display the widget. If you don’t make any selections, the widget will be displayed globally on your site, exactly like a default WordPress widget. The option to conditionally display widgets will help you to tailor your sidebar to the main content from page to page as necessary.
Flexible Widgets is a great plugin for enhancing WordPress as a CMS. Download it for free from the plugin repository.
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It looks like this feature, or similar might be on its way into WordPress 3.4. Fingers crossed.
http://twitter.com/#!/janeforshort/status/112340183952785408
We’ve been using Dynamic Widgets for this functionality for a while now. We also offer itto our MU users as a supporter plugin to fine tune their sites.
http://wordpress.org/extend/plugins/dynamic-widgets/
While DW is further along because of its age, it would be fascinating to see a side-by-side comparison of the two for usability, interface, ease of use and so on.
Does this work with BuddyPress as well – as in, does it detect WordPress component pages?
Great plugin. However it doesn’t seem to be compatible with the Social Media Tabs plugin (http://bit.ly/nrSdcB) or SOUP plugin (http://bit.ly/qUEOQA). It’d be nice if it’d place nice with those. Otherwise, very nifty.
I think that “widget logic” plugin does better job than this one.
Sarah maybe you can make article like Widget Logiv VS Flexible Widgets
Just my 2 cents ;)
Thanks