The site went down briefly earlier in the week when the server that the site was hosted on was close to maxing out its disk space. We cleared up the clutter, but it looked like it went down yesterday as we were migrating the images to Amazon to free up more space.
In any case, we did some mitigating measure for the time being to bring the site up, and will complete the migration tonight. After that, everything should be fine.
Thanks for understanding.