Wiki pages for plugins now show the installation counts over time. This information is computed from the anonymous usage statistics that we collect, and therefore only reflect unknown percentage of the real installations. The usage statistics are further filtered in an attempt to remove "non serious" instances — those that are running sporadically or doesn't regularly check back in to the mothership.
There is also general statistics page using the same data: http://stats.jenkins-ci.org/jenkins-stats
This page tells you things like:
In addition, the page also displays a graph of the inter plugin dependencies
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