Just curious if anyone still codes for IE6? I pretty much concentrate on IE7, but I've had a few sites that look different in IE6 than IE7.

IE6 still accounts for a significant amount of web-usage. It is simply unwise not to account for it. As you say, there are often differences between it and other browsers (not that IE7 is perfect, far from it).

Why can't IE just go away?

Oh yea, that's right, then my wouldn't be able to perform Windows Updates through their browser!