[lusr]

Hmmm I wasn't too impressed with DDG results in the past. I just tried it again with "efficient self organising maps implementation". The DDG results are completely useless nevermind almost totally irrelevant to my query. Then I remembered American English spelling and tried again with "organizing". DDG results improved, but the fact I have to remember such details is annoying (I don't with Google, Yahoo or Bing).

Having run the query on the other engines, Google & Bing are on par (I use Google exclusively but should probably check Bing from time to time), Yahoo 2nd most useful (somewhat generic results, though), DDG 3rd (student projects in the search results vs. published papers in the other engine results, results that are overly broad) and Blekko the worst (it seems to just pump out results with one or two of the words I queried, no concept of relevance).