It appears IE 7 is the only browser affected, I had no problem loading it via Safari and Foxfire. I removed the Sitemeter link to my front page (had to do it through Safari) and I'm in business again via IE 7.
Sitemeter changed their code yesterday without an announcement or, apparently, any testing.
I can't even load Sitemeter's main page on IE 7. There are no notices of any kind or any acknowledgement of problems on their site... prompting me to rename the service:
Gotta love Photoshop!