The term Web 2.0 apps is a rather well-worn concept by now but it may be unfamiliar to readers of this post. Briefly, a Web 2.0 site contains user generated information that can be re-used across different sites. Using Flickr and Blogger together is an example. Being able to drop a YouTube video here would be too.
The thing I like about this shiny Windows Live Writer is that it sort of covers up all the 'mechanics' under a common interface. One might not need to know what's going on 'under the hood', so to speak. I cannot help but see this as a future trend . . . (by Microsoft?)