Russ has pulled together a FANTASTIC comparison overview of Blip Messaging and Email,

// @author RussMiles.com - Home - Got email? I’d rather have a BLIP…

At the heart of LLUP is the BLIP. The BLIP is a piece of content, declared in a standard way using XML, that specifies four main things:

* A reference
A pointer to the content that the BLIP describes.
* A lifetime
How long the BLIP will be relevant for.
* Relevancy
Listed as keywords by a defined or undefined vocabulary. Can also include a signature or signatures of those who should receive the BLIP.
* Signature
A means of signing the message by the message sender.

There’s more at the above linked reference.

Thanks Russ!