One of the best hidden power features that KDE has are its web shortcuts, allowing you to jump to everywhere on the web from your desktop. Whenever you open your launcher by pressing ALT+F2 you can use shortcuts for various web services. For instance, you can search Google with gg:searchterm, Google images with ggi:penguins and Wikipedia with wp:kde. Using these abbreviations you can go to literally hundreds of websites, including those added yourself.

You can find all the shortcuts by going to System Settings, Account details, Web Shortcuts.