I posted a link to Pat Grant's excellently self-promoted and self-published graphic novel 'Blue', last week. This timely follow up is from his blog, and details the breakdown of costings for his project. It's really quite disappointing to see how much money is required, and the great risk involved to Pat directly. It's a solid breakdown though, and gives you a bit of an idea where all the money disappears to in such projects (hint: most doesn't go to the author).
Have a look here: http://www.patgrantart.com/boltonblue/blog/?p=150