QUICK RESOURCE SHEET #27
Idioms
"Since idiomatic
expressions are so frequently encountered in both spoken and written
discourse, they require special attention in language programs and
should not be relegated to a position of secondary importance in the
curriculum."
Cooper, 1998
http://www.readwritethink.org/lessons/lesson_view.asp?id=254
I like this link because it provides an unusually well-designed and fully developed lesson plan for the teaching of idioms, linking theory to practice. It includes clearly defined learning objectives, and links to one of the best online idiom activities, which not only helps students practice using idiomatic expressions, but encourages meaningful application of the newly learned phrases.
http://home.t-online.de/home/toni.goeller/idiom_wm/
There are hundreds of sites with lists of idioms in English, but this site has a few special features. It allows you to search for idioms alphabetically or by a word contained in the idiom, or even by topic. It also allows you to click back and forth between different idioms with similar meanings. Moreover, the site is interactive, in that users are invited to make contributions to the site.
http://abisamra02.tripod.com/idioms/#why
This website is not the most attractively designed, but I include the link for its clear and detailed outline covering most aspects of the teaching of idioms, as well as for its comprehensive list of relevant links.