pixel differences on safari, firefox, IE

Can't say specifically what's happening, but I can tell you something I observed. Looking at the image, the CSS has it placed using the top property. If you decrease it in Safari by a pixel, things lien up properly. This means something on the page is causing your background image to end up 1 pixel sooner. Tracking that down could take some time, but isn't likely related to the image's CSS. It's one of the reasons I don't care for absolute positioned layouts. Hopefully that hint will help out.

 

I have noticed that Safari, Firefox, and IE all render placement is CSS a little differently. Although with your site, I don't notice a difference in Safari and Firefox.

 

Changing the Text size in Safari (command+ or command-) moves the images outside of the white frames, and generally borks the entire layout.

BTW, I really like the site design.