ognigiorno

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PostSummary allow you to add a widget with a kind of preview of your posts. You can add a list like the newspaper sites 
or a list of posts really similar to adsense style. You can mix your posts and adsense with the same aspect. 
Every instance of the widget is independent and can be configured separately. 
You can choose the categories to be displayed or if the lias is made of the most recent posts or, if you have statpresscn plugin, 
the most read posts.

PostSummary

Postsummary creates a widget that contains a list of posts with title and the beginning of the text. You can style and add a thumbnail.

darrinb

Generates a template tag that allows you to easily display a snapshot of text. 
Useful for meta descriptions, post snippets, or your own custom block of text. 
Displays a snippet of text without having to use the <–!more–> quicktag.

WP Snapshot

Easily display a summary of post text or custom text.

PostSummary vs WP Snapshot