Lots of buzz for BumpTop, a desktop manager for Windows. It’s got a nice pedigree: here’s the CHI 2006 paper on which it’s based. More pedigree: Andy Hertzfeld (legendary Macintosh system programmer) is an investor.
What I can’t figure out is how they got around Apple’s patent on piles. (Here's a good overview of piles and the desktop in a hypertextual thesis by Matthias Müller-Prove). If piles are no longer off-limits, we can look for a bunch of interesting innovations.