I use three buckets and am a firm believer that the fewer collectors you have the better. As you are supposed to always have a bucket with you, I would suggest that you have at least one physical collector available (remember the eletromagnetic pulse).
My buckets are:
1. My Palm (Treo 640) software BugMe; 2. Loose paper leaves that I always carry around in my shirt pocket; 3. A notepad that I always carry with me.
This is the result of 3 timeboxes of 30 min To do: -Fix the links and review the article;