Design
Dell refers to the small form factor 9010 as a Desktop, which it is in the older sense of the word--a PC that literally sits on top of your desk. At only 12 inches deep, by 11 inches tall, by 5 inches thick it will fit easily beside a monitor, or flipped on its side, serve as a monitor stand. Styled in black and gray, it also looks like it belongs on your desk. Being small also makes it easy to hide away, if that's your preference.
Dell's been playing the corporate game for a long time and that experience shows in the Optiplex 9010 Desktop. It's powerful, has all the features businesses ask for and just enough expansion to add a random capability you might need. The 9010 Desktop's small form factor makes for convenient placement, but if want more extensive expansion capabilities; the 9010 is also available in a variety of other form factors.