Members of Open Shakespeare are gradually writing and uploading a series of short introductions for each of the plays. These will eventually be supplemented by longer critical introductions and general essays to enhance your reading. All of these introductions can, like the primary texts themselves, be annotated and edited by visitors to the site.

As an example, here’s the short intro to Measure for Measure:

http://www.openshakespeare.org/work/info/measure_for_measure

Enjoy reading!