Isn't the OS categorisation a good thing if they only work on certain OSes?
Anyway, as for USB host on Diablo - I start "USB" from my "Settings" application menu and click "Host".
Sounds sensible. Could even have nice large images of each of the tablets to click on.
Depends if the index is going to be maintained by hand (allowing different titles on the index from the page itself) or auto-generated as much as possible.
I favour the latter (reduces work), and so would try strenuously to avoid a "how to" prefix unless absolutely necessary. After all, it's a tutorial - it's going to be a "how to".