The blog of Seth Godin is a source of short and well written posts that usually make you think. The other extraordinary thing is that they appear day after day for the last 14 years.
I believe that writing and communicating ideas is one of the most valuable skills anyone can learn. To become better I take Seth Godin as inspiring example and will publish 21 posts on a day by day basis.
To reduce possible excuses around my expectations I will limit the posts to 300 words a piece and aim for 150 words.
If you are unfamiliar with Seth Godin take a look and browse around for a little while.