Subnotebook vs. UMPC vs. Netbook: WTF Is the Difference?

When Blam broke the news on Dell's mini Inspiron, there was one he was stuck on: How to categorize it. Is it a subnotebook? A UMPC? A netbook? (Knowing the specs might have helped, but probably not much.) Part of the problem is that the category names themselves are very new and pretty vague. Here's a mini-compendium… » 5/30/08 5:00pm 5/30/08 5:00pm