Shiitakes are also supposed to like coffee grounds. I'm planning to give it a try soon; I got the idea from seeing shiitake kits to which you're supposed to add your daily grounds. (I'd like to try on a larger and more cost-effective scale with spawn and the grounds I can get from the local coffee shop.) A company in my area called BTTR Ventures does a good business growing both oyster & shiitake mushrooms in coffee grounds (at least, I *think* they're still growing mushrooms as well as the grow-your-own kits that are their latest big thing).

I've yet to try doing this myself (just came to poke around the forums and see where people recommend ordering spawn), so I don't know how easy it is. From the web, it certainly seems that oysters are the most popular to grow this way, which might indicate that they're the easiest.

I could generalize from there and speculate that since shiitakes usually like a wood substrate, other mushrooms that like a wood substrate might also like a coffee ground substrate, but I don't know--might be a good starting idea for research, though.