Wirelessly posted (8700g: BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
Also, a group is a distribution list. You create a group, add contacts to the group, then send a message to everyone in the group just by addressing the meassage to the group. Category is tagging a contact as business or personal, or projectan or whatever you want. Then say, you could filter you contacts (or tasks or calendar) on a project, or look only at personal items, or whatever.