Microsoft Project Professional
Note: This review addresses v2007 of the product.If you run or work in a small business--or work for a medium or large business--it's easy to get swamped by planning and managing complex projects. With Microsoft Project 2007, you'll be able to tackle a project of any size, not matter how complex and daunting it may be.
Project 2007 just about every tool you can imagine for managing projects, from basics such as setting schedules and creating task lists, to sophisticated, such as creating visual reports of a project's progress. It will help you keep projects on track, and manage all of their associated tasks and resources.
Keep in mind that this is not a simple program; there's a steep learning curve. It's a very big, very complex program that takes up plenty of hard disk space and RAM, so if you're only managing relatively small projects, it's overkill. But if you're overwhelmed by very large projects that threaten to eat up all your free time, it can be a help.
Note: This link takes you to the vendor's site, where you must register to download the software.