I would like to make a suggestion to the Twenty Eleven developers for the wordpress.com theme.
There is a great widget called Twenty Eleven Ephemera where you can show the different post types like Quotes, Asides etc.
Firstly I would like to be able to choose which Post Type is used in that Widget (and if it had categories to choose from also, that would make it even more flexible). .
Secondly I would like to be able to show all Posts, or Posts with a particular category, but NOT including Ephemera Post Types (ie only standard posts).
At the moment there is no way to show only Standard Posts or Recent Standard Posts in a widget, because all the Ephemera Post Types are included in the Widget.