The shutdown icon in the top left corner should be changed.. I'd be happy to provide some alternatives! Can you tell me the size of that icon? Then I'd send make and send you some and see how it looks!
Also maybe the running programs icons should be a taddd bitt smaller.. They take too much space, especially if you have a bunch more apps running.
I think something is not quite right about this dialog... I mean... there's too much colors I think, at first sight it just split my focus. It would be better with a monochrome shutdown icon, and/or the app icons should have a little transparency (around 48-64%... I'm from tablet now, I can't try it myself but tomorrow I will).
Er... the situation isn't that bad as it seems from my feedback... actually I love this mockup,
Nah, accidentally i send it while i was writing. -.-" so i just wanted to say that i love this mockup, and i think its clean and elegant enough in this stage already, i just mentioned some ideas about how it could be even better (in my opinion).