The webhost that I picked (HostGator), and thus my website, was recently the victim of an extremely dangerous hack.
Specifically, from around Thu 21 Sep 2006 to 9 pm CT Fri 22 Sep (when I shut my site down), Internet Explorer visitors were not being fed the correct HTML data, but instead corrupted data that included a link to a malicious website that took advantage of a new [zero-day] IE exploit to crap all over people's machines.
At least one of my visitors, who I had enlisted to confirm that it was the website that had issues (as opposed to my local machine), was infected with viruses, pop-ups, and God knows what else.
I noticed that two visitors came to look at my element photos, early (2-3 am Central USA time) on Thu. In case those are some people from ChemicalForums, you should be watchful for problems on your machines. The hack may not have started that early, but I currently do not know.
My stuff is down until I am sure that my pages will be served as I entered them, which might be a while.
This is apparently a problem in the 'cPanel' configuration software on servers. A flaw allowed someone with access to a local account (either a real account or one hacked into) to root the server, and install malicious web server software. Although only HostGator is confirmed to have been attacked, other hosts are likely vulnerable to this.
Most of the virus/spyware/who-knows crap seems to be new and not yet detected by most scanners.
Note that there are 3 new exploits involved in this:
1 - New exploit in cPanel on servers allowing root access
2 - New exploit in IE allowing arbitrary code execution
3 - New spyware/viruses that are not yet caught by scanners
Yuck, Yuck, Yuck.