if your a windows developer you may already have seen some of Scott Hanselman's previous lists and you know that it's well worth a look, in this newest version, the new entry's are highlighted in red.
If your a windows 8 user, check out the window 8.1 store apps that Scott uses for some really solid win 8 apps and he's also got a section there on stuff thats already in windows 8 that you may not be aware of