One task that every one should do it is deleting useless files. If you do not, you will run out of disk space inevitably. Then, you will wonder where my disk space has gone?

Filelight is the answer to you. Filelight creates an interactive map of concentric, segmented rings that help visualize disk usage on your computer. Like a pie-chart, but the segments nest, allowing you to easily see which files are taking up all your space.

Here what you see when you open Filelight first time.

And here when you dig down in your filesystem.

Here you can get rid of space wasters by opening it in konqueror or delete it directly.

For gnome guys, Baobab will give you seem functionality.

You can install Filelight on openSUSE 11.2 by clicking on this link  1-Click Install . For other distributions, you will find it in your package manager.