Wired wrote an interesting article last year about spammers choking referral logs with bogus links on many popular 'blog' sites. Well it finally happened to me this month.
The behavior I discovered appears to be the result of a small script run on the attackers machine (in this case a single IP) which streams hundreds of false referrer and user agent strings in an attempt to make the log appear legit.
In any case, please disregard the referrer listings in the Site Reports section ... and certainly don't click on any of the links. Unfortunately I may have to discontinue that portion of the site completely; I'll keep an eye on the situation over the next few days.
Note: Due to the possibility of further abuse, the Site Reports section has been shut down.