To get your pupils acquainted with a diversity of aspects of English, I would say these

site are of use to you.  You can print and disscuss them at the classroom, make a role play game etc.

http://www.bbc.co.uk/dna/mble/F2712585
http://forums.eslcafe.com/teacher/
http://www.economist.com/

http://news.bbc.co.uk/2/hi/talking_point/default.stm

this one is open to anyone wishing participate, so some messages may have a flawed

English, but also have native (most British nationals) opinions/participations. You could pick errors and teach to your students the right way of writting the words/sentences etc.

http://www.dilbert.com/

Corporate talking, in a funny way.

http://www.thefunnycartoon.com/

http://www.npr.org/templates/story/story.php?storyId=124319820

http://www.suntimes.com/lifestyles/abby/index.html

Lifestyle advice worded in a comtemporary and up-to-date English.

Hope it helps.