Qwiki is an app that hides in your menu bar, until you really need to search for that vital bit of information.
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Qwiki for Mac Lets You Search and Read Wikipedia Directly From Your Menu BarOS X: If you frequently visit Wikipedia with your questions and want the encyclopedic resource to be one click away, Qwiki for Mac brings the site to your menu bar without every having to launch your browser.
Use Wikipedia on Your Mac More Efficiently with These ToolsGoing straight to the Wikipedia in your browser is fine, but there are better ways to access the site if you're on a Mac.
Qwiki and Wonder: No-Nonsense Wikipedia ResearchThere was a time, before Twitter implemented restrictive API limitations, when Twitter clients were a playground where app developers tried new ideas. It felt like there was a new Twitter client released every week. Today, that role seems to have been taken over by Wikipedia apps. There are a lot of good Wikipedia apps.