Logitech G11 dualboxing trip report:
Once you figure out the best way to run the G key binds (so that they activate on the alt client and don't activate anything on the main client in any kind of way) this is the best thing ever. Shaman healbotting main warrior, disc priest supporting main shadowpriest, etc. It's cheap compared to other tools that help multiboxing, so get it. ASAP. Make sure you get the G11/G15 that has 18 G keys, not any dumbed down more modern revision.