I've been involved on Windows Forms development for years and one of the common requests that I've always received from customers is to have an application's user interface similar as more as possible to Office.
Office look actually is always more the "de-facto standard" for Windows applications and building a .NET Winform GUI with Office look is not so easy (and Microsoft has never helped us on this). Obviously, there are lots of commercial controls available to have a GUI more Office-like, but this is not always the best choice, expecially if you want to control every part of your application.
In the last days (after lots of requests on forums, newsgroups, blogs etc.) seems that something on this direction is moving (Microsoft has recently released some .NET 2.0 examples on how to write a UI similar to Outlook 2003 for example) but more must be done I think.
Why not releasing examples on how to write an application with the Office 2003 look, with the Office 2003 toolbar and menus for example? This could be extremely useful (expecially having in on .NET 1.1 and 2.0 and with VB.NET and C# examples).
Now the future Office 12 is on the air and the next "de-facto standard" for Winform UI will be surely the new Office 12 "Ribbon". We'll be ready to build application with this new type of interface or not?
I think the answer will be certainly NO! 
To have real examples on how to write Office 2003-like UI we've waited for years... and now? Someone has just started to work hard on this direction and the first commercial controls "Ribbon-like" will be available soon I think, but I can't understand why we can't have an example on how to write this by Microsoft.
Why not releasing a Starter Kit to build a user interface with the Office 12 look? Is it so difficult? I don't think that this could be an hard work for Microsoft, and this is a needs that Winform developers have always more.
Having an official Microsoft Starter Kit or an official .NET Control could be an important step on customer's satisfaction and on help the developers to build applications with interfaces more "standard".
I hope someone could listen this request and I hope that we don't have to wait the Office 13 (or Office 2007) coming to have a "Ribbon" control from Microsoft. 