One of my current tasks is sifting through the IE documentation on MSDN with the SDK documentation team. There's a lot of it and some articles date back to 1997 or even earlier! Some of those articles are good and need a minimal refresh, some need a complete rewrite while others need archiving as they are no longer relevant to the technologies in use today. This isn't a project that will be completed overnight but if there are particular articles you find useful or believe we need then please let me know. We're also looking at how to organise documentation so that commonly used topics can easily be found. For example we have a set of DHTML performance articles around that have been written at different times and remain quite useful, I'd like to see us bring together so that people can easily find that content.
Let us know what you'd like to see. We are heads down working on updating content for IE7 at the moment so this is as I say a long term project. Also if you notice any errors in the documentation please let us know so that we can correct them.