MC Hammer's jacket from "U Can't Touch This"
I've never sought out a ultra light wind jacket as I always used my rain coat to cover those bases until recently. I splurged on this little ditty, and am pretty stoked thus far. Ultimately this jacket is pretty much a one note pony, but who cares because it plays that note like Kenny G's circulating breath http://www.youtube.com/watch?v=ozeQfOdapIU.
But really this thing is great for ultralight hiking, a wind breaker for belays on long climbs, and for a little extra warmth on that day where you couldn't decide whether or not you should pack that extra layer. You'll also look like a back up dancer for Hammer in the process.