It looks like the main ExifTool web server is currently down. This seems to happen every year over the Christmas holidays, but I don't know why.
Hopefully it will be up again soon, but until then the ExifTool homepage may be accessed via the mirror here (http://130.15.24.87/~phil/exiftool/).
- Phil
The ExifTool web server is back online. It turns out that the system was down because our sysadmin was upgrading it to 64-bit Linux.
- Phil