I'm a big fan of Basecamp (http://basecamp.com/). With a small group, it is pretty easy to get by with just the free version and it handles distribution and archiving of emails. Unless you're looking for time-tracking, it has done a very good job for a couple of the projects I've worked on. I've noticed a few people get excited about the ability for it to store files and have "wikis" (called "whiteboards" in Basecamp), though it is easy to outgrow the free version quickly. I generally use it as a scheduling, to-do list (with assignments), and email system. You can always complement the file storage with Dropbox or an internal file system.
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Lin, Kun
Sent: Monday, January 14, 2013 1:27 PM
To: [log in to unmask]
Subject: [CODE4LIB] project management system
Our library is looking for a project management system. Does anyone has any suggestions on which one to choose? We only have a very small team and our main focus is to guide our librarians to submit their ideas and for record tacking purposes.