A while ago I found this book called "You can draw in 30 days" by Mark Kistler.
It's a collection of drawing lesson dealing with subjects such as basic drawing, perspective, shading etc.
While I cannot really say that one would learn to draw in 30 days, this book is actually really nice to work with. I've done the program twice already and after that time I've decided to go over it every six months.
Now it is time to start another round. The goal is to draw every single day for 30 minutes and perfect my skills. I will be intentionally working with 8B pencil and posting my results here and on my LJ page.
These are lessons 1+2.
I do invite you to joing me, the prosess is really fun.