This may come as a surprise given the lack of a Disel logo anywhere on the site but this is where something odd happened.
This was available via http://www.bestupidatwork.com/ Now it isn't. Something happened, some kind of dispute or question of ownership and now it's gone but turned up at a different URL. Sans branding.
Either that or two people just happened to make exactly the same tool within a week of each other and one got pulled for some utterly unrelated reason but I'm running with Occam's Razor on this one.
See: http://www.adweek.com/adfreak/diesel-makes-facebook-look-exc... http://www.theatlantic.com/technology/archive/2011/06/hide-y...
For those of you that are convinced you'd still know something is up -- there are also all sorts of reasons why XP Excel running on other systems would be totally legitimate -- could be running in a virtualbox window, could be running in a remote desktop window, etc.
we're already 'workin' on it...