Take a break
Workrave is one piece of software I use all the time. It's a program that assists in the recovery and prevention of Repetitive Strain Injury (RSI). The program frequently alerts you to take micro-pauses, rest breaks and restricts you to your daily limit. Great stuff and it saves my eyesight from getting any worse (beside other things).
The only problem is the one I have with Linux version. When it pops up micro-break, I can click the rest break button. However, at my job, I allowed rest break to be cut off, as I could have a client on the phone, and it's not a good idea to keep them waiting. So, basically I can kill off the micro break, which is bad. I'd like program to force me to have that microbreak. So, it's O.K. for micro break to have a rest break button, when when I enter rest break from there I should only be able to go back to micro break, and in no condition be able to break from it completely.