Display scheduled/future posts list on your WordPress dashboard. Require WP 2.7 or above.

Future Dashboard Widget

Display scheduled/future posts list on your WordPress dashboard.  Require WP 2.7 or above.

timlinden

Remembering to post every day, and which days you already posted, is super easy with this plugin. 
It shows you a calendar with days red when there isn’t a post, and days green when there is. Green 
days you can hover over and see the title of the post, and click to edit the post for that day.

wpFutureCal

A simple calendar that displays when you edit posts, showing which days you have posted on.

Future Dashboard Widget vs wpFutureCal