Two years ago, we introduced pkgstats. This time, after a major revamp, we are re-introducing it to you!
Contributing is as easy as installing the package - a weekly cron job will take care of the rest. You will be sending us a list of packages installed on your system, along with the architecture and mirror you use. This information is anonymous and cannot be used to identify you, but it will help us prioritize our efforts and make Arch even better. So, go ahead and spread the word!
For more details see pkgstats -h, read the simple source code and visit our forums. You can view the collected data at the statistics page.