Yahoo Running Mediapartners UA

Yahoo visiting pages using MediaPartners UA

[The Contractor]

Ok, what's Yahoo up to? Checked whois on the IP and it goes back to Yahoo. Two different IP's for the Mediapartners bot.

A visitor from bff201.search.dcn.yahoo.com (216.155.200.231) was logged once, starting at 10:35:35 AM on Saturday, July 10, 2004.
The initial browser was Mediapartners-Google/2.1.

A visitor from bff202.search.dcn.yahoo.com (216.155.200.232) was logged 3 times, starting at 10:35:34 AM on Saturday, July 10, 2004.
The initial browser was Mediapartners-Google/2.1.

Then visited using:
A visitor from bff205.search.dcn.yahoo.com (216.155.198.60) was logged once, starting at 10:35:47 AM on Saturday, July 10, 2004.
The initial browser was Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax).

[fiestagirl]

Looks like they're ckecking out what they can see with multiple user agents.
Another thread here: [webmasterworld.com...]