There are a couple different ideas mentioned among the comments here, and I believe we should have some good news for you on each.
1) Last login - We're opening a beta for Pro & Enterprise customers that shows Last Login information in User Settings. If you would like access please fill out this form: https://forms.gle/PQvL8N5iyL2eL9Sb6
2) Sales Activity reporting - We've recently released a new Sales Productivity Report (in Reports > Analytics Tools > Sales Productivity) that shows all activities by user. For any feedback on that report, feel free to respond via the feedback tool on that page, or by emailing me at lars (at) hubspot.com
3) Audit log - While we don't have a full audit log available today, this is something that our team is looking at and is being planned.
For any other questions, please don't hesitate to reach out (email listed above).
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