If you have ever looked for a very simple and minimalistic panel, which only displays the tasks that are currently open in your  Linux desktop then check out Fspanel. Fspanel uses only about 10 kilobytes of disk space and is also really low on memory demand.By default Fspanel  comes as ready as it can be: with a white background and a tasklist. There is virtually no customization options available but then again Fspanel does its job well and is s very fast on loading itself.

Below is a screenshot of Fspanel.

You should be able to find Fspanel in majority of today’s modern distributions. In case Fspanel is missing you can obtain the source code of it from here: http://freecode.com/projects/fspanel and build it yourself.

Note: Since the freecode page above points to Ubuntu package archive page you will want to download the file ending with orig.tar.gz if you are building from source.

Some usage tips: If you click on the left corner of the panel you can make the panel place itself on the bottom or on the top area of you screen.
If you click on the right side of the panel you can make the panel withdraw to a minimal state, leaving only a small portion of it visible.