If one of the list admins sent this through; please don't. It's *spam*.
They crawl the web for e-mail addresses and then send these things out as advertisements for their link-checking / availability service. Which, of course, means they're crawling our web site and loading it down. *Thanks* so much.
The HTML mail also contains a "web bug": a 1x1 pixel transparent GIF image which contains a unique ID number and additionally sets a cookie when you view it, which happens automatically on many popular e-mail clients.
-- brion vibber (brion @ pobox.com)