Here's a useful keyboard command that lets you quickly search the iTunes Store in OS X or Windows.
1. Type your text into the search box in iTunes.
2. Hold down the Option key in OS X or the Shift key in Windows while pressing Enter or Return.
Regardless of where you are in iTunes, you'll see search results from the iTunes Store. This is a very quick and handy way of searching the iTunes Store without having to go into it first.
Read more: iLounge