This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
It depends on how the images will be used. If they are largely for display, I recommend keeping them on the file system. Until HTML5 is widely used in which case, they can just stream as part of the page.