An example of how Diigo can be used to highlight lexical chunks in articles and websites. See related post on my blog.
Just The Word collocations - helps you in writing English...
Netspeak helps you improve your writing. It is a new kind of dictionary which contains billions of phrases and how commonly they are used. See this post on my blog about how to use Netspeak in class: http://leoxicon.blogspot.com/2012/05/lexical-priming.html
Playing with lexical cards
Some practical suggestions on how to use Just-the-Word in (and out of) class