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Anyone know anything about this spider which has been at my site quite frequently?
Welcome to WebmasterWorld [webmasterworld.com]!
Following the link given in the user-agent field reveals a family-safe portal site at mobrien.com with a fairly-detailed page about its robot.
Take a look at that site, and if it can benefit you to be listed there, then I don't see any reason to block this spider as long as it is not misbehaving.
HTH,
Jim