KDE has always intrigued me a lot, though I never started using it on daily basis for production purposes. It is really user-friendly, plasma interface looks awesome, effects are subtle and KDE 4.9.* is quite stable with loads of KDE specific applications. Almost every popular distro now has a KDE edition for the users, an evidence of the growing popularity of KDE.

I chose some of the prominent 32-bit KDE editions that got released in 2012, namely:

Ubuntu: Kubuntu 12.04.1 LTS, Kubuntu 12.10, Linux Mint 13 KDE, Linux Mint 14
Fedora: Fedora 17 KDE, Kororaa 17 KDE
OpenSUSE: OpenSUSE 12.2 KDE
PCLinuxOS: PCLinuxOS 2012.08 KDE
Slackware: Slackel 14 KDE, Slackel 4.9.2 KDE
Gentoo: Sabayon 10 KDE
Arch: Manjaro 0.8.3 KDE, Bridge Linux 2012.12 KDE
Mandriva: Mageia 2 KDE, ROSA 2012 Marathon KDE

rest here