DssW has released Activity Audit v1.1, a program which creates a journal of application use using calendar events. It is designed not only to track what was used and for how long, but to reveal patterns of activity and usage that can highlight where efficiencies might be improved and energy could be saved. The new version refines the journal process by allowing for auditing to be suspended when the Mac is not actively in use, and now includes a status menu to show when auditing is occurring.
