PHProjekt is taylored for teamwork on projects - it features assignment of tasks, follow-up, a great calendar to share times and ressources (such as rooms, projectors, cars etc.), client request tracking tools, and a project description tool that supports dependencies (like "task X starts at ... but not earlier than Y"), and draws a simple Gantt chart - and all of this is web based collaboration.
This answer may belong to the "Tips and tricks" section even less than the question 
but you may like to look at some groupware tools (my favorite is PHProjekt at www.phprojekt.com - you can test a demo there) and hack the one you choose to work with Moodle or post the request to do so in the appropriate forum here.
PHProjekt is taylored for teamwork on projects - it features assignment of tasks, follow-up, a great calendar to share times and ressources (such as rooms, projectors, cars etc.), client request tracking tools, and a project description tool that supports dependencies (like "task X starts at ... but not earlier than Y"), and draws a simple Gantt chart - and all of this is web based collaboration.
PHProjekt is taylored for teamwork on projects - it features assignment of tasks, follow-up, a great calendar to share times and ressources (such as rooms, projectors, cars etc.), client request tracking tools, and a project description tool that supports dependencies (like "task X starts at ... but not earlier than Y"), and draws a simple Gantt chart - and all of this is web based collaboration.