I am recording two solos at the moment.
NOW COMPLETE! My current fiction solo is Cleek: The Man of the Forty Faces, which is a rattling good detective yarn featuring Hamilton Cleek, a man of quite remarkable (well, to be honest, totally impossible) talents. It is great fun.
I may have bitten off more than I can chew with my non-fiction solo, French Self-Taught by Franz J. L Thimm. I am attempting to contribute to the development of a language learning resource at Librivox using, of course, books which are all in the Public Domain. This, as you can imagine, has its disadvantages, as many languages have changed radically since the books were written.