Please add your own entries, and increment the vote count for features that interest you.  IMPORTANT: Please try and consider your suggestions from an IntelliJ design and terminology viewpoint rather than trying to insert ideas that are concepts from other IDEs that don't make sense in the IDEA world.

Debugging

Editing

Execution & Testing 

Grails

Currently, Grails suggestions are being collected in a non-IDE specific location.

Misc

Refactoring

Templating