Sometimes it can be useful to hide the new notice on the top in the administration, added in version 2.3. (I speak about the notice that's shown if you don't use the latest version of WP.) I don't really know how many people would like to switch this announcement off, so I'm not able to consider how useful such a switch button would be, but as far as I know, there is currently no switch in Settings, yet. :-) And I need it, from time to time.
Search results: Hide the update notice
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Let’s hide the update notice in administration! - English
Published: On Thursday, November 1, 2007