I'm sure IE7 is a long way from a full release and you'll have to use the Beta version for some considerable time. I've tried IE7 Beta and it's certainly a lot better than IE6, but that's not saying much. If you want the IE7 features but in a stable package look at Opera v8.5 or Firefox. They are complete stable packages and are better than IE7 will be, even when it's released as a full vesion.
I uninstalled IE7 Beta because I had lots of problems when it was installed on an almost new laptop. But that's just my experience. I know the Forum Editor has been using it for several months without problems.