Click on any of the buttons and a window pops up, offering you all sort of things you can now do. Places to buy, places to post, ways to bookmark.
After exploring that, take a look at the bottom of each of my posts. There's a 'flare' (perhaps named after the buttons Jennifer Aniston wore in Office Space) that brings the functionality of services like Technorati into the blog at the same time it makes it easy to bring the pithiness of the blog out to Digg, etc. [Sometimes the flare magically disappears... hey, life is a beta. If you don't see it, try the next one down].
The sooner we view the web as a process, not a place, the quicker we will understand it. It's two flows. The flow of information and the flow of attention.