When students are working on long or short term projects, it is important for the teacher and the students to be able to easily track group progress. Trello does this in a very visual and drag-and-drop fashion. Signing up for Trello is easy, especially if you use the Google sign-in option.
The website uses the metaphor of a board where users create lists and cards. Each list can have multiple cards and users assigned to each card. Once the teacher creates a board and lists, students can easily be searched for and added to the board.
Trello board for my students' screencasting project.
Currently, my students are working on a video project with multiple steps. I have created a board for the project and a list for each step along the way. After adding my students to the board, they each create a card with explains where they are at on that step and who is in their group. When a group finishes a step in the project they simply drag their card to the next list, which is also the next step in the project. When I login to Trello I am able to see at a glance where each group is at and which groups may need my help to get to the next step.
Before using Trello I would walk around to each group and ask for a status update. This process could be time-consuming and frequently I would get stuck helping one group, only to discover another group needed my attention. Trello boards for each project let me see at a glance track student and group progress and intervene when and where necessary.
Here is a video explaining the basics about how to setup Trello from the Youtube channel InfoSharer.