When you need a good reference for shortcuts, the xCuts widget will probably have what you’re looking for - right on your Dashboard.

Remembering all the keyboard shortcuts Mac OS X has to offer is just about impossible. Lesser known songs lyrics may not be available, but for the vast majority of popular music it works great. All you need to do is play a song in iTunes, launch Dashboard, and the lyrics will automatically display and copy right into iTunes.

Harmonic makes it extremely easy to get lyrics to your favorite songs.

This widget will quickly get album cover art from Amazon’s large database for the currently selected songs in iTunes. If a song or album isn’t for sale in iTunes, no cover art for you. ITunes automatically downloads album cover art for your music, but only if you have an iTunes account and if they sell the music in your library. At a glance you can check your CPU & RAM usage, available hard drive space, network status & speeds, internal temperatures, fan speed, battery levels, current processes, and more - all with a great, elegantly designed interface. The ultimate widget to get an overview of everything that’s going on with your Mac. Of course, not everybody’s favorite can be included so if there’s one you feel should be added to the list, let us know in the comments! Our list of 12 must-have widgets covers a wide range of categories, which should appeal to pretty much everyone looking to get the most out of their Mac experience. With that said, a good widget can be both fun and useful. Most Dashboard widgets are useless pieces of crap.

Make mac dashboard widgets bigger