I'm trying to get a better overview of my tasks, and I'm looking for a tool which would let me enter tasks (everything from 2 hour tasks to 2 week tasks) and then simply let me organize these tasks on a timeline.

I'm thinking that all tasks would have an estimated duration, and I could then prioritize these tasks by moving them along the timeline to prioritize them. The timeline would then show me the "tasks stack" and how far into the future i'm occupied.

I'm not looking for an issue/bug handling system, but simply a tool which lets me get an overview of my tasks. I guess we're more into the category of resource planning.

What tools do you use for this?