JustBlogIt with a simple right-click.: "The next time you find an interesting item to blog about, just select something you want to quote, right-click and JustBlogIt.
You can also skip the text-selection step and JustBlogIt will do something reasonable.

The real beauty is seen when blogging from within a News Reader. You
can select some text or not, right-click, and JustBlogIt will recognize
you are within a News Reader and extract the relevant information from
the nearest blog entry."