From Ubuntu to Mint over the GNOME3
More than 5 years of using Ubuntu has finished after I saw Ubuntu 11.10 with GNOME3 "fallback mode" and Unity on board. I even didn't have to think of an alternative: about Mint I heard long ago and only positives. And all came true: all of the familiar Linux tools in stylish, almost perfect interface.
UPD: Finally left whole Ubuntu behind, felt in love with Linux Mint Debian