Recently I've started using a great little free windows app called NextAction which you can get from here.
It's greatness comes from it's simplicity and it really helps to refocus and stay on track when dealing with all the days distractions ... email, co-workers, scrums, rss feeds, twitter, lunch, coffee breaks, etc. Having a list of what I'm working on always there on the desktop makes it very easy focus after any context switch.
Much better than pencil and paper, check it out for yourself.
NOTE: There is a more comprehensive web based 'NextAction' at code.google ... not so good for me, but maybe for others.