My current project is a more powerful version of a Z80 based multitasking GPC that I helped a guy I work with design and build. I will also be designing an 8085 version. Both will have support for plug and go (plug and play sounds silly considering the thing is not for playing games) using eight AT-esque expansion slots.
Why use CPU that are so old you ask? Because theyre simple to design systems for and hobbyests still use 8 bit systems quite often.