"Two important aspects about managing multiple projects with multiple teams are scheduling of the projects & milestones and allocation of resources to these projects. Over the past few years we have been using a simple Google Spreadsheet based utility which we had developed in-house to schedule projects and to allocate resources for projects. We had earlier released this as Free Software under a GPL license and made this available as free template and over 1000 users are currently using this tool.
The utility is available as a free Google Spreadsheet Template"
Via Martin Hawksey