сервис Wordle

Wordle – a free website that creates "word clouds" (or "tag clouds") for text analysis. 

Simply copy/paste text and in seconds Wordle gives you a visual representation of word frequency. 
Click the screen shots below to enlarge. You can directly type into the Wordle text box,that allows you to get text directly from online sources or your own text document. Student can either work on their individual Wordles or collaborate together on one. In the later case, it's probably most efficient to gather all their writing into one text document before copy/pasting it into a Wordle. Use tilde sign to create phrases. Example: learning~strategies. Another tip: After you create a Wordle, right click a term to remove it from the Wordle results.

  So how could your students use Wordle? 

Defining skills - Before the dictionary comes out, give your students a new vocabulary word and ask them to brainstorm all the word they associate with it. Gather up all the brainstormed words for a Wordle. After the term has been formally defined, repeat the process and compare to the "pre-dictionary" Wordle.

Summarizing skills – As a pre-reading exercise – copy/paste text of reading into a Wordle and ask students to predict what the main ideas of the reading will be. Another pre-reading option – give them a Wordle of a non-fiction reading and ask them to use the Wordle to generate a title or headline before they see the real article. Post reading – ask them to reflect on the reading based on a prompt (examples – main idea, what you've learned, funniest element, etc). Then collect all their reflections into a Wordle. 

Comparison skills – Give them two different accounts / essays on the same theme / event – let them compare the Wordles generated by each. Or you could generate Wordles for two different reading – then let student see if they can match the Wordle to it's corresponding reading.

Sourse: http://www.peterpappas.com/2009/01/build-literacy-skills-with-wordle.html