Hey folks, thought it might be a good idea to chime in and let everyone know what's going on.
My host recently decided to move my sites to another server on a whim. The old servers were 32-bit, the new ones are 64-bit, and are running a different version of PHP. This move broke all of my sites that used a modified php.ini horribly, and I had to go fix them all. Somewhere in this mess, somebody managed to upload two .html files that redirected to reycross, which I assume is a malware distribution site. One was uploaded as an avatar, and another as an upload into the public uploads section.
I have removed the offending files and requested a review of the site from Google. Hopefully this will fix the issue Firefox and Chrome users are having. I also plan to look into how exactly the files got there, and from where.
In a day or two it should be fine again.
Sorry. =/