TargetProcess supports Release and Iteration planning via flexible drag and drop areas.
Release Planning
All planning vanilla is there: features, users stories and bugs in the backlog, color coding of priorities, time line for releases, release real end date forecast based on history data, sorting and filtering.
Iteration Planning
TargetProcess visualize stories effort via box size and story priority via box color. Iteration capacity clearly visible as well. You almost feel how many stories can be assigned to iteration.