Show Your Brand!
The logo is one of the easiest ways to show your company brand on the web and offline. Look at the Microsoft logo for example. Anyone who's been on the web knows that when you see one big square that is broken into four smaller squares, each with a set color (red and green on the top, blue and gold on the bottom), you're being reminded of Microsoft, whether it's a product, website or something else.
Below is some of my best logo creations: