Obviously, you can check out the world of Spyderco, just by heading over to Spyderco.com.
But, in the vein of making this site about the Mule Team knives, I will provide a few links to specific parts of the site.
The last, but no longer avaialable Mule Team offering in 9Cr18Mo:
http://spyderco.com/catalog/details.php?product=426
Previously, the Mule Team knives were made out of 52100, CPM M4, CPM S90V, and Hitachi ZDP-189.
Spyderco hosts their own Forum, or Discussion Boards.
The General Discussion Board is a good place to find information about the Mules.
But, if you find searching page after page a bit monotonous, you can search the Board via Google quite quickly. Just enter the following into the Google Search Engine.... "site:spyderco.com mule"
Also, there are almost always a couple of thread with Mule Team images in them, going on in the Spyderco Picture Gallery
Enjoy,
Marion