Those who have been around me the last 6 months know that I have been focusing more attention to the GTD methodology in my professional and personal life.
Having lived through the multi-tasking mentality and its lack of long-term effectiveness I have been working on an idea called "productive task time". Today I ran across an interesting term called Chunking which is very similar to the PTT.
The idea of each is to set aside defined "chunks" of time for events/tasks instead of mutli-tasking a number of events at the same time. If you are having trouble juggling multiple tasks and giving them the proper attention to completion that they deserve give this idea a try.