If you want to promote key mappings use in Eclipse, MouseFeed might be your ticket. This Eclipse plugin monitors your mouse usage, and when you click on a UI component (button, menu, etc.) that can be invoked by key stroke, the MouseFeed plugin will pop up a small notification window stating that the action has a key mapping. The notification window disappears after a few seconds, but it's power is obvious. Very similar to the Key Promoter plugin in IntelliJ IDEA. Very cool Eclipse plugin.
Here is a screencast of the MouseFeed plugin in action: