This page shows the trend over time for tags
The top 200 tags with most questions were selected, and then for each of the tags, the number of questions tagged was obtained. The percentage of a specific tag compared to the total amount of questions was calculated. Finally, the values were divided by month, from August 2008 to March 2012.
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Top rising technologies

Tag% questions (2010/2011)% questions (2011/2012)% change
asp.net-mvc-30.21%1.10%+423.54%
ios0.67%3.17%+371.54%
android-layout0.08%0.38%+357.64%
facebook-graph-api0.09%0.39%+323.69%
node.js0.10%0.42%+303.93%
ruby-on-rails-30.59%1.21%+106.49%
facebook0.60%1.09%+82.71%
mongodb0.18%0.33%+81.81%
html50.36%0.63%+75.23%
android4.61%7.60%+64.62%

Top falling technologies

Tag% questions (2010/2011)% questions (2011/2012)% change
asp.net-mvc-20.64%0.14%-77.65%
visual-studio-20080.48%0.17%-64.26%
sql-server-20050.53%0.25%-52.26%
linq-to-sql0.34%0.17%-50.92%
drupal0.45%0.24%-46.15%
asp.net-mvc1.29%0.75%-41.41%
nhibernate0.44%0.26%-40.86%
database-design0.31%0.19%-38.52%
design-patterns0.32%0.20%-37.13%
svn0.42%0.27%-36.27%