According to Google's SafeBrowsing diagnostic there are two links of concern, one of which has apparently been cleared up.
I would assume that problem is either a third-party ad server, forum spam, or other compromise which allowed links to Bad Sites(tm) to appear.
There's a forum post which describes the issue called "LuckySploit Trojan HERE!?!?" Olaf makes a good point, and I quote it below to encourage members of AO not to make the same potential mistake:
obarthel doth sayeth:
But then these IPv4 addresses now show up in the forum entries which quote the Google description of the issue. You might want to remove these from the text, just in case Google's scanner doesn't know how to tell a forum entry and a JavaScript hack apart and only keys off the IPv4 addresses.
