KS Project Planner for Windows
This is a very leightweight but powerfull project management solution with tons of features.
Built on top of the KS-Gantt control it offers all functionality implemented in a modern DotNet technology.
This means fast and intelligent planning of tasks and resources in an interactive gantt-chart.
KS-ProjectPlanner might be a smart and free alternative to ms-project for you, just check it out!