I've received e-mails saying that the photos can't be seen on my site.  I figured it was a firewall issue, but have not had a chance to personally troubleshoot a problem machine.

My friend Peter  had this same issue. Sure enough, he tinkered around with his McAfee firewall program. Volia! He could see the photos again.

Apparently, there are known issues with McAfee blocking legitimate content and tagging the content as ads:

See http://forums.mcafeehelp.com/showthread.php?t=174528 

To see the photos on my site and others, follow these steps:

Click on 'Block Ads' Tab.
Uncheck 'Block Ads' on this computer.
Uncheck 'Block Pop-ups' on this computer.

Firefox (and the new version of Internet Explorer..blech!) have built in pop-up blocking and some ad content blocking abilities anyway.

I know when I worked at Indra's Net , there were ALWAYS issues with personal firewall and virus checkers messing Internet connectivity and e-mail up!  A good little troubleshooting tip to keep in mind if you have Internet connection issues in general.