This week's book giveaway is in the Agile and Other Processes forum. We're giving away four copies of The Little Book of Impediments (e-book only) and have Tom Perry 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.