One of the most significant changes Google made when designing the keyboard for Chrome OS notebooks was replacing the Caps Lock key with a search key. Although the search key is not very useful since it only opens a new tab, the Caps Lock key made a lot of comments, forum threads and emails unreadable.
If you actually need to use the Caps Lock key, there's a way to change the search key into a Caps Lock key in the settings. Unfortunately, this is time consuming, particularly if you constantly switch between the search key and the Caps Lock key. There's a better way: press both Shift keys at the same time to enable or disable Caps Lock. It's an undocumented shortcut that works in the newest versions of Chrome OS.