I only really like the W2K/NT4/98 Interface for Windows.
Right now, on Linux, I am using XFCE. They have stated in the mailing list, they are going to continue using GTK version 2 until version 3, works out things to make it work better.
Heck, GIMP still is using GTK v2. What makes you think GTK version 3 is going to eclipse version 2 anytime soon.
Oh, by the way... (not really for CRC) but do you know what *GTK* stands for? (Hint: http://www.gtk.org/)...
Yeah, *NOT* GNOME. Though it is managed by the GNOME Foundation.