The one 34-minute video here is a compilation of the 10 three-plus-minute episodes of an old U.K. Web series produced to promote Microsoft's products. The series was preceded by two blogs on Windows Live Spaces, which continued until the series' end in December 2008. Apart from promoting Windows Live, Silverlight, and a few other Microsoft products simply by being a mixed-media experience which aired on those services, it was also the pilot to a show which might have been produced in 2009 if this series had gotten the reaction its creators hoped it would. The full series would have begun airing in early 2009, so it doesn't look like KIRILL will be continued in any fashion.
Blogs:
http://vivianvillars.spaces.live.com/ -- Vivienne Villars (for whom Kirill is searching).
http://quantumstu.spaces.live.com/ -- Stuart Patrick (Viv's blogging counterpart).
It's unfortunate, because I think it showed a lot of promise, but it's easy to see that the show isn't as broadly accessible as so much of television. It keeps people guessing and thinking for themselves, rather than giving straight answers. I tend to enjoy that sort of thing, provided it isn't just a cheap way for the writers to string their viewers along without telling a story, like so much of television.
If you actually watch this video and read all the blogs, things will come together much more nicely, and you might get a better idea of exactly what's happening and who Kirill is---but it isn't required, if you pay close enough attention to the show, especially the clips showing Vivienne or the occasional narrations by Quantum Stu. (Pause the video at times, if you must, to get a better look at the clues being given to you.)
I would have been interested to see this develop into a full series, though I also realize it might have lost its edge at and intrigue at that point. A part of me hopes its appearance on Hulu means it still has a chance of being revived. It is just strange enough, just different enough, to capture my heart and my interest, as TALES FROM A PARALLEL UNIVERSE did some years ago. But when that miniseries was made a full series, it became LEXX, which didn't interest me nearly as much (and no longer had Eva Habermann to support it). It's always sad when a promising story doesn't continue in any way, but sometimes it's for the best and lets us appreciate the work itself more fully.