Greetings Jesse,
Thanks for the feedback. It seems that once I removed the drop shadows from the images, the situation resolved itself. Clearly there was a sizing issue with one or more of the images that was throwing the CSS float out of kilter.
The reason that I named the images prod-1, prod-2, prod-3, was to semi-automate future image changes. As these are background images, populated through CSS, rather then HTML, I understood that they had no influence on SEO.
Sorry about your headache, and 'Yes', you were quite right that the 'Happy Monkey' font was totally over the top! That came about because of my mistake in the CSS Links, and has since been resolved.
I have been trying to identify a jQuery Gallery or Lightbox to use instead of CSS, but without luck so far.
Again, my thanks for your critique.