I found both of these to be fair descriptions of what is going on:
http://www.autospeed.com/cms/A_2269/article.html
"Diesel vs Hybrid - the Battlelines are Drawn"
http://www.autospeed.com/cms/A_109237/article.html
"Diesel or Hybrid or Petrol?"
Both are excellent, fair reviews of the issues.
Bob Wilson