The whole "Jafaikan" / "Jafaican" issue seems to have caught the media's imagination, so here are some links to other features on it:
Daily Mail - Jafaican is wiping out inner-city accents
Daily Mail - Understanding Jafaican
Evening Standard - Why we is all talkin like Ali G
ENA5 - Language Change & Varieties
Thanks to Helen, Opey and "The Library Skets" for some of these links.