I've successfully used the washing machine to kill my former phone. Just forget it in your pocket and start washing!
That said, I also have a freerunner. It's great fun and very useful to hack on, but so far I've not started using it as a phone. My main issues with it is that the battery life is too short, no GUI to connect to bluetooth headsets and a general instability (especially when suspending). Personally I'm prepared to wait for the software to stabilize and improve, but I understand people who dismiss the freerunner for these reasons.
(The phone I washed was the one I got from work. Had to order a new one among great embarrassment)