I recently started using workrave, mainly because my cow-orkers have both suffered from RSI to some degree or other and I thought prevention might be better than cure. However I'm finding it really fucking annoying. I do not cope well with interruptions when I'm in the middle of something and it ends up really pissing me off.

I'm sure it's all a good idea and everything, but I've just found myself switching it into quiet mode so I can actually get some work done without having my flow of concentration constantly broken.