HDD usage icon display

perhaps im missing something simple, but ive been nocticing that alot of people have gorgeous drive icons, then a small bit of text displaying % used or free space, and i cant figure out how to do this. i operate on windows, and i just dont see anything anywhere. if anyone has any advice, it would be much appreciated.

http://images.customize.org/category/ss/Lunakapped1-0_full.g
if has an excellent example of what i mean.