I used Vitamin R for a while, then again, later, from time to time. It's interesting, but seemed to require a lot of care and feeding. I found that I was fiddling with the software, and using it as another distraction.

Far less distracting and more effective, I find, is noting the three or four things that need my focus on a 3x2 index card and keeping that card in front of me or in my my pocket, referring to it frequently, until all those things on done. Then picking up a new card and repeating the procedure. That little card defines the roadmap and is far more effective than software.