CopyDesk English Grammar Guide
Part of the American Copy Editors Society website (ACES), Copy editor Pam Nelson's blog, the grammar guide, is a prominent feature on the ACES website. Her original blog — Triangle Grammar Guide — was set up to help readers — more than journalists — understand why newspapers do what they do as far as grammar goes.
Although it wasn't created specifically for English teachers, the blog nonetheless contains a wealth of material, including grammar quizzes, articles on grammar and also common errors, of interest to both first language and ESL teachers.
Most of the quizzes are better suited to native speakers or upper-level ESL students, and are far more interesting than many offered elsewhere. Visit this site!