Hello
Tux is the Linux mascot. Linux stands for freedom.
The quality of the icons found on this website is impressive, but it feels it's going to waste by the restrictive terms of agreement. 
But on the Terms of Agreement it says:
- If you wish to use the tux for graphics creation (example : a wallpaper), you must specify the source, author name and put a link to Tux.CrystalXP.net and Everaldo.com
- If you are a webmaster and you wish to use some tux on your website, the agreement of a CrystalXP.net administrator is necessary (dlb@crystalxp.net)
I think that the usage should be more freely.
What do you think?
Have you heard about the Creative Commons ?