It used to be in the menus with User List etc.

Here's another way to do it, sorting the user list by Last Online, it shows those that are cloaked too. shocked It goes by the last 10 minutes for those not cloaked (yellow). Those cloaked will not be in yellow. The Last Online times listed are actually when you last logged in, either manually or if you have your browser set to log in automatically, not your recent activity.