From another thread ... I didn't know time outs could be bad and maybe doesn't even work if you do try it.
For us it worked out great, we only did a hard time out once (aka him moving out of the chair and we had to put him back and make sure he did his 3 minutes - I believe the first time took 30 minutes to an hour), it works great for us and we rarely have to put him in time out. We just say "If you do that again you get time out" and he shapes up.
I'm just curious if you have tried time out did it work or not work for you?