Played around with a little 4'th edition D&D. I lost interest: our games went very slowly because of a few players in the group (every time we'd play, had to be reminded on what their abilities did, had to be reminded it was their turn, couldn't make any moves until they'd thoroughly studied the (unchanged) map), so we stagnated alot. Ideas for new things popped up WAY faster than they could happen in game. New campaigns were thought of, and new people constantly brought in (some desiring to switch to 3.5, or 3.0, or blardegarble rules...).
It got boring. I stopped showing up to games.