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We currently receive a count of the number of logins, broken down by quickstations, cluster machines, other machines, and dialups. Unique login counts are also available. This is posted weekly in sysd_stats.
We also have data from a script which polls machines via busyd every 5 minutes and thus gets login session duration (accurate to +/- 5 minutes). That data lives on skywest in a SQL db.
Application Usage
For slw-wrapped applications, we have access to logs which tell us when an application was used, for how long, and the hostname of the machine on which it was run. The hostname of the machine can be used to determine whether or not it's a cluster machine. We know that certain wrapped applications provide incorrect duration information, but we can take that into account when compiling the data. Even without duration information, unique launches are still relevant.
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Note that usage statistics will be skewed once fall term starts and Debathena is used in earnest. For example, users launching OpenOffice from the panel or by typing ooffice will get the locally installed version, and users explicitly using athrun or add -f will get the wrapped version in AFS.
Presentation
While data at the weekly level may be relevant, there are enough fluctuations that data should likely be presented at the monthly level, possibly with quarterly summaries. We should keep in mind that usage declines somewhat during IAP, and declines significantly in the Summer.