We just released the latest version of our software. We have added tagging to tasks and milestones. You can add as many tags as you would like to a task. This helps to categories tasks as needed. For example you can set priorities, classify some tasks as bug or features etc. We have also added a free form search to the task & milestone page. Now you can search tasks based on tags, status (open, close), user (any team member) or any text. For example you can search for a task which has a tag called bug, a user called John, it is Open and has the word test in its description. For large projects with hundreds of tasks this is a great tool.
Another improvement is in the whiteboard. We have added layers, copy and paste functionality to the whiteboard. This tools make drawing and presentation using the whiteboard much easier now .