I agree with kallensource on both counts. Excerpts are optional, so the plugin shouldn’t break without them. This is a surprising oversight since the plugin was developed in part by Automattic!
It is often desirable to add share links to both the top and the bottom of a post. Some people share when they read the headline or first couple paragraphs, others only share once they have read an entire article.
I would add that it is odd to omit Google+/Google Buzz. There isn’t much selection here compared with other plugins.
Whoops… looks like I wanted a Contributor role.
