I really doubt anyone on the forum could create a tutorial of C programming comparable to all the amazing books out there. It doesn't matter if the book isn't specifically microcontroller orientated, because the C is the same no matter what.
New books may be too expensive, but there are many sources of second-hand books. Also, if you search hard enough for any book, cough*rapidshare*cough, you will probably be able to find the book in pdf form.
A tutorial id like to see is MCU audio. Maybe 1-bit audio. It looks really interesting.
Anyone have any experience with it?