One of my favorite features in Visual Studio is IntelliSense auto-completion. That is, if I type “XmlEl” and hit Ctrl+Space, it will fill in the rest for me – “ement”. If I haven't typed enough characters – “XmlE” could be completed with “lement”, “ntity”, etc. – it gives me a little list of identifiers to choose from, and selects the most likely candidate as the default.

Microsoft Word needs this feature. Just a few moments ago, I typed “Indispe” ... and wasn't sure how to spell the rest. I can guess, and then look for the red wavy underline, of course, but wouldn't it be better if I could hit Ctrl+Space, and voilà! It correctly completes the word with “nsable”. Now that would be cool.