The SharePoint Capacity Planning Tool (Beta) provides a wealth of helpful information when planning a SharePoint Products and Technologies deployment; helping administrators, consultants, and IT Pros determine the potential required hardware investment(s) and topologies to support and meet requirements for availability and performance or even the affect of introducing additonal offices with their own unique bandwidth and latency constraints.
Using the SharePoint Capacity Planning Tool (Beta) you can build topology models, run simulations, and generate reports that will help you evaluate and identify alternative solutions considering profile-based usage variations, content size and scope, networking technology, and availability requirements.
The SharePoint Capacity Planning Tool (Beta) provides both Windows SharePoint Services 3.0 and Microsoft Office SharePoint Server 2007 models allowing you to explore the unique characteristics of each platform and more effectively and efficiently plan topologies based on their respective infrastructure requirements.
To being using the SharePoint Capacity Planning Tool (Beta) or to learn more visit: connect.microsoft.com
Source : Bill Baer's blog
