Not religiously, but I have a pomodoro app which I keep installed for work I'm struggling with. If I'm lacking motivation to start or finish something I'll stick it on and get going.

It's incredibly easy to procrastinate when we have Facebook, HN, WhatsApp, email - whatever, but I know if I start a pomodoro it's only ever 25, 22, 17, 9, 3 minutes until I can take 'reward' myself with the aforementioned for a few minutes. It's easy to push through knowing I only _have_ to do (at most) 25 minutes more work. And once I'm rolling, it's a lot easier to continue.

I use Harvest throughout the day to check how much _actual_ work I'm getting done. This helps me make better estimates of times and costs (as well as see the days I'm most and least productive).