So I have a suggestion. Add a Users Guides section somewhere on TinyCLR.com that lists all the available User Guides.
Another place would be to list the User Guides / Brochures in a Sticky Forum Post in the following forums:
[ulist].NET Gadgeteer and FEZ Spider[/ulist]
[ulist]EMX & FEZ Cobra[/ulist]
[ulist]FEZ Rhino, Domino, Mini, Panda and USBizi[/ulist]