One of the things I have noticed running http://www.langpop.com is that, pulling data from different sources, the odds are surprisingly hight that at any given point in time, one of the sources will be out of wack, often in a subtle way that’s hard to see in the results. For instance, in the December 2nd run, the Amazon results were a bit wonky, and Delicious has been gradually falling out of the Yahoo search results (weird, that). I decided to go with screen scraping for Delicious, even though, frustratingly, Delicious can’t tell the difference between C, C++ and C#, so while we wait and hope that that gets fixed, those languages are all going to show nearly identical results. I have updated the site.