Note: On the advice of some fellow forumites, I switched to PNGs for this update, as it was supposed to make files smaller and thus improve your load times. Well, eyeballing the file sizes as they uploaded sure made them look bigger; please let me know if you think things are better, worse, or about the same with PNGs instead of my usual JPGs.
PNGs smaller?! No, no, no!
I only use PNGs when I want transparency in a picture, but I don't think that's relevant for you.