A Web Spider that walks through pages looking for email addresses, which will later be sent SpamMail. They generally abuse HTTP and ignore the http://www.usemod.com/cgi-bin/mb.pl?RobotsExclusionStandard, so they can impose a heavy load on a server.

In reply, see SpiderTrap.

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There are many web sites covering rude spiders in general.  I have found http://www.webmasterworld.com/ to be quite detailed, but I can't say I need or want to pay that much attention.

Watch out for the trademark violation robots too...NSFlagservice@comcast.net

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See also
WikiSpamBot
which walks through wiki pages in a very similar fashion, but then posts spam directly on those pages.