Teambox is probably the best value out there for project management of a team. If you are already using google drive, dropbox then it is even better as it integrates all of those features together. They even have a google hangout/skype type of application where you can video chat and share screens. It brings together the tools people are already using and integrates them on to a single platform. The price is ridiculously inexpensive especially when you compare it to the competition. $5/ month for the pro version is basically "free". They even give you a 20% off discount for an annual subscription, but at their super low price it doesn't even really matter.