The reading thinking stem encourages students to think critically about their reading. I have my students write at least one a week. Their improvement in reading AND writing is remarkable throughout the year!
For help on introducing thinking stems, see my blog post here: http://www.fortheloveofteaching.net/2011/10/how-to-introduce-thinking-stems-to-your.html
Also check out the thinking stem rubrics, bookmarks, and math thinking stem guide here on TPT.