So I've been using the McDar tool along with those from SEOlogs and SEO Contests to track the rankings for the infamous "V7ndotcom elursrebmem" keyphrase - great tools and very useful, especially the former which is super easy/fast. For my site, all of those tools show around #4/#5 across dozens of datacenters. But I've started to see it pop up at #2 when using www.google.com/search?q=V7ndotcom+elursrebmem (here is a screenshot) as have others. Plus the DP keyword tracker and my own (both using the API) show #2. The only thing I can think of is that there must be some other/new datacenters out there that are not represented in those tools that www.google.com is resolving too.
Try http://www.seocritique.com/serptool/serplist.htm. This tool shows datacenters that McDar is not showing and gets updated more frequently.