Hours would slip by without me even realizing. This is how I deal with it with great success:
1. On a peace of paper I write down "Super simple & quick" as title
2. List all things needed to be done as I think of them
3. Sort them by importance and due-dates (write numbers in front of items)
4. Strike them through as I finish them
The main point here is I'm always thinking this is "super simple & quick" small thing I could do to finish particular item on that list.
I start with the smallest, quickest and easiest thing to do. Then funny thing happens... I get momentum and solving another one small thing that comes from solving previous one is so simple & quick I just might do it right now and forget about it.
In the evening, it's such a great feeling seeing a list full of striked-through items. And I still get to participate in forums, twitter and read a whole lot of emails.
Hope it helps...