Hope it's not just me but I'm seeing odd things happening here at DP. I just made this post about big weight changes and funny reports in the Keyword ranking tool and when checking it noticed my last blog entry link had dissappeared. Just thought I'd mention it in case its not a known problem.
It's been fixed... although the blog entry thing was not touched (and I see yours)... that might have been a network connection to your server a the time it checked or something.