I first came across Barbara Hambly as a Star Trek writer. She wrote Ishmael, a Spock-centric story which was a crossover between Trek and Here Come the Brides (which starred Mark Lenard as the antagonist - who also played Spock's dad, Sarek, of course). She also threw in lots of references to characters from various TV Westerns of the time. It was great fun! I think there was some problem with copyright, though, when it first came out.
I liked the Darwath series, too, and some day I'll get round to trying the Benjamin January series.