I recently got a book called ["Self Therapy for the Stutterer"](http://www.amazon.com/Self-Therapy-Stutterer-Malcolm-Fraser/dp/0933388454) and it has various exercises broken down into nine (I think) steps. I practice 'in my head' many times during the day. Whatever step I'm working on at the time, such as slowing down or easing into difficult sounds, I try and exercise that aspect of my speech as I think. It's not quite the same as the real thing, but it's very easy to do. After work I usually spend 30 minutes in my lazy boy reading stuff online. 3-4 times a week I spend 10 minutes reading out loud.