Widget Manager manages your widgets. Not really. Actually YOU manage your widgets via your widgets sub-tab. What this lets you do is copy the widget config from a blog you pick as your "mother blog" to any and all other blogs. Useful if you want the same, or basically the same widget selection on all your blogs is the thing. Like, copy the "mother" config over to a new blog, then do minor tweaks to make the new blog be exactly what it needs to be.
Sape Plugin allows you to sell links from your blog pages on Sape.ru, one of the leading link exchange services in Russia.
This plugin allows integrating Flickr images into your blog.
This plugin will replace all ocurrence of tags of the form: [[en:Article Title]] with links to the corresponing article in the respective wikipedia international site (as specified by the two letter language code). For instance, an entry like
[[en:DNA]] will produce a link to
http://en.wikipedia.org/wiki/DNA, while an entry like
[[no:Næringsstoff]] will produce a link to
Note: The pie chart feature is broken, but the rest of the plugin works as expected.