using xubuntu 11.10 now. KDE was fun to play with, and looks really good but I wasn't diggin' how much RAM it used up. It got to the point where my system would be eating as much as 700+ MB of RAM just doing simple tasks. Doing resource intensive stuff like transcoding video files was causing system lock ups.
XFCE likes to sit right around 125MB of RAM though. Much faster on my less than impressive hardware.
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