If you haven't seen it yet, check out the new Office 2007 Ribbon. This changes the age old toolbars and menus that most applications have. There has been recent releases of commercial components that mimic the UI (Sand Ribbon, DotNetBar). If you are looking for free components that get close to the same effect check out Ascend .Net on CodePlex (another great site) and the mentas Ribbon on GotDotNet.