How about adding a sticky to the Feature Request section of the forums detailing features you are planning on adding. Or is that somewhere else on the site and I just haven't seen it yet? I've spent a lot of time trying to figure out what you might be adding and when while trying to evaluate your product, that we are going to purchase. A simple road map would help me request features that haven't been requested and might go along with items currently planned.
Simple format Next feature update: Expected Release Q2 07 Do not send notification check box when updating a request. Feature X Feature Y Feature Z
Next revision: Expected Release Q4 07 (SD7) Feature one Feature two Feature three
Features requested that have not been place on a schedule: 1 2 3