UPDATE: Some of Supa's CSS maps have been found, more on this later...
I've noticed that a lot of people are ending up here seeking Supa's awesome Day of Defeat: Source and Counter Strike: Source maps. Unfortunately, they are not currently available at this location. XSGameDesign.com closed its doors (hopefully temporarily) about two years ago, and all previously hosted content went with it.
Supa: Please contact me at coestar@gmail.com if you would like to provide your old maps for me to host here. It would be my honor to do so.
In the meantime, I will attempt to track down any of the maps I can from other places on the internet and provide links to them here. If anyone else knows of good, working download links to these maps, please feel free to let me know at coestar@gmail.com.
Thanks, and happy gaming.