Allow me to draw straight lines so you can build quadrants, etc. for organization
Ability to draw boxes, quadrants, and custom columns so you can organize your thoughts tdls and cards exactly how you need to see them, then you can easily move cards between columns/quadrants.
I would add that the ability to align cards to top, center or bottom would be helpful (see MS powerpoint alignment tools for the user experience)
Tej Shah commented
This would be great. I would like to recommend holding shift key and moving left to right or up and down for straight lines.