You might have noticed Microsoft have released Beta 2 of IE7. Maybe you made the mistake of installing it, not knowing that it overwrites your current install of IE6. Well, if you were put off playing with the new version because of this, you can now install IE7 without removing IE6. Instructions at Digg.com.
I followed the instructions and got it to work. For me I had to open the setup .exe in Winzip (righ-click - open with) and extract the files from there. It seems quite buggy though. Whether the buggyness is down to it being or beta or the unorthodox installation I'm not sure. Still, it can be done.
As you'd expect, the first thing I did was visit this site. It's broken! Microsoft have fixed a lot of CSS bugs in this release. They even asked all developers to test their sites in IE7. I can see why. They might be taking positive action to improve IE, but it looks like being a pain for us lot. Should make better developers of us though, now we don't/can't rely on CSS hacks.
If you're simply curious what it looks like then see this post. At this rate, some time soon, all browsers will look the same.