Personnaly I do not use it that often but I see users using in their mails trying to put certain information into visible separate blocks.
The default Horizontal Rule is just plain ugly and does not fit with the Eclipse based client. The variation options are also quiet limited....
|Right-click actions on the Slide-In "New Mail" alert|
|Implement a responsive frontend framework (like Bootstrap)|
|Security for CSS files|
|Warn/prevent user when using non-autorized chars in folder name|
|J2LS wrapper to assist migration from IBM Domino to Java|
|Support Open Document Format for exporting search results|
|Add "Accepted" to implementation plans|
|Extend existing webservices of IdeaJam|
|Link IdeaJam with Greenhouse Idea Blogs and vice-versa (Connections, ...) ?|