What I really like about your site is being understated. While the mouse-over gives valuable information, the relatively large white background is quite stark. Just My Opinion.
Hmmmm.... yes I agree - I was running into a unique problem when I made up the font. Since the labels are static but the photo constantly change; it was difficult to find a font that was readable at all times of day/night. The outline helps make the labels more readable when the images change. I think I can reduce the background and see if that helps.