Profile → My dashboards: a new tab on your own profile (team members and client contacts) lists every dashboard you built, with how many widgets each holds and which one you land on. From there you can add a dashboard, open it, change its widgets, rename it or delete it. Admins can also mark a dashboard as the team default from the same list.
Updates
Dashboard: the menu in the dashboard bar is gone. The bar now only switches between your dashboards with the colour dots; adding, editing, renaming, deleting and marking a team default are done from Profile → My dashboards.