A new forum update is coming soon, and one of the features I'm looking forward to is Device Management. This makes it more difficult for others to gain unauthorized access to your account.
From the IPS Community website:
Notification of a new device sign in
If enabled, users can receive an email notification when a new device is used to log into their account:
When a user signs in for the first time, a special key is set to recognise the browser on subsequent logins. This mean the notification email does not trigger on a new IP address, which would be annoying when travelling or if using a network where the IP address changes regularly. Instead, the notification is only triggered if someone signs into your account from a new physical device or web browser.
UserCP Device Management
If enabled, a new page will show in the user's settings page showing all the devices which have been used to log into their within the last 90 days (which is recent enough that could still be logged in if "Remember Me" was checked).
Users can see the device, browser, physical location (obtained by a GeoIP lookup) and if applicable, how the login was processed (for example, if the sign in was with Facebook or Twitter, this will show). If they chose "Remember Me" when logging in, they can undo that (handy if you realise you accidentally left yourself signed in on a public computer).
If they see anything they don't recognise, a page to walk them through the necessary steps to re-secure their account is available.