Trello is a collaboration tool that organizes your projects into boards. In one glance, Trello tells you what's being worked on, who's working on what, and where something is in a process.
I'm using it at work to keep an overview of all the projects that we are working on, and it is really intuitive like that.
We use one board. We currently have 6 lists (Inbox, in planning, in progress, in testing, done, postponed). 3 labels (scheduled, priority, nice to have). Each project is a card, it belongs optionally to one or more labels, but always to one of the lists.
With the features of activity messages, checklists and due dates this allows us to keep on top of things. It works well in addition to a helpdesk because there are no reports options and it's not a communication tool.