www.onestopenglish.com - the website has a huge lesson planning section

www.onestopenglish.com/146578.article - this article by Jim Scrivener is about different methods of writing lesson plans.

www.teachingenglish.org.uk - this website also has a number of articles on this topic; some examples are below:

www.teachingenglish.org.uk/lesson-plans - this section has a collection of lesson plans to try out in the classroom.

www.teachingenglish.org.uk/articles/planning-1 - this article looks at why lesson planning is important.

www.teachingenglish.org.uk/articles/planning-a-grammar-lesson - this article looks at planning a grammar lesson