The API docs that are published with Xamarin Studio are fantastic and provides a high level of detail about the API
However, the help docs do not include any help at all about Xamarin Studio itself, such as adding components, settings, faq, etc.
The information is available on the Xamarin Site and looks great there but that won't help you if your on a train and wondering how to find a feature of the tool with no internet connection.
I know were in an always connected world but it would be nice for completeness
Also how about documentation updates for Xamarin Studio through the update channel as well (if it doesn't already)