Great idea!
Tutorials I'd like to see (some of these are not necessarily tutorials, but lists of tips and tricks that people use):
1. Advanced smartlist creation. I'd love to see some of the tricks that people use and some insight into some of the more esoteric smartlist functions. Of course if you do an advanced tutorial, you probably also need...
2. Smartlist creation. Basic smartlist functions and use
3. Custom views. Custom views + Smartlists.
4. Command line tips and tricks
5. Automation with external tools (Girder, etc.)
6. Cover art management
(right now, the cover art functionality is not intuitive)
7. Tricks with custom and calculated tags (for instance, I added a tag called 'Best of' so that I could make a 'Best of' smartlist that plays, what I consider to be, the best songs of each artist.
I can probably think of more, but this is a good start.