By <em>comparing each others</em> among time using the following methods :
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From the books sales : (not a public application)
Book Sales as a Technology Trend Indicator
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From google (they really has knowledge in everything)
Google trends
Here is a sample search : continuum, hudson, cruise control
Hudson is here a false positive. Google indexes trends on the web database, a world where Hudson is not exclusively the famous continuous integration server...
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And my favorite :
From the (us) job market :
I have just discover the indeed.com trend graph service.
Here are some samples:
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This information is very useful since it is based on real software industry needs (job offers). But the data relevance can be biased by the fact it is only based on this compagny database jobs (not worldwide scoped).
