The SEOMoz.org page strength tool is, uhh, shall we say slightly inaccurate? For many weeks they've been showing my website with 2,766,679 .edu or .gov links. Can you imagine the traffic and PR I must have! Not! I have precisely two .edu links and a modest PR (5). My point? Most of the online tools are indeed "for entertainment purposes only". I get a good chuckle when I see directories advertising their "page strength". EDIT: Apologies for the duplicate post. Somehow I hit the button twice and it posted twice.