Tip of the Day/Eclipse Tips
Now, where was I?
Workbench editors keep a navigation history. If you open a second editor while you're editing, you can press Navigate > Backward (Alt+Left Arrow, or the Left arrow icon back on the workbench toolbar) to go back to the last editor. This makes working with several open editors a whole lot easier.
Show in System Explorer
If you select a resource and right click, there is a Show In > System Explorer context menu entry that will open the folder containing that resource in your system's file explorer.
You can store tips in a Json file that can be fetched from the internet dynamically.