The Windows Mobile 5.0 Documentation is on MSDN, and yes, I admit this is a sub-optimal approach as ideally it should be in the Visual Studio documentation along with everything else. Eventually, we'll get it in there. In the meantime, you need to make MSDN's copy of the docs a bookmark.
So to ease your pain, I've been wondering what we can do to make the docs more usable and discoverable. One idea that occured to me was a change in approach to the idea of a Table Of Contents.
I've a question for you - would you use something like what follows? Your feedback is going to drive this completely, so let me know either with comments or directly to johnkenn at microsoft (the links in this sample should work, by the way).
Upated: As per feedback, I took out the "|"s and yes, it looks much better. And don't worry, this is never going to replace the TOC on the left hand pane.
|Windows Mobile 5.0 SDK Documentation|