http://blogs.techrepublic.com.com/10things?p=262

They missed me: “The Itch Scratcher”
Ignores the work in hand and instead concentrates on something that bothers him and him alone; fixing some bug unseen by anyone else or creating a new application to do something only he wants done.
Naturally, as that new project becomes “work” it too will be abanded in favour of a new itch to scratch.