In "Higurashi no Naku Koro ni", Hoshi-sama voices Keiichi Maehara. Maehara is listed as one of the main characters. I have the first episode of this, but I haven't watched it yet, so I can't comment on it.
In "Digimon Savers", Hoshi-sama voices Daimon Masaru. Masaru is the main character, and sounds almost exactly like Sugino from "Tactics", and is the "I wanna fight strong people" type of character (but he doesn't sound as much like Nagi Souichiro from "Tenjho Tenge" as he does Sugino).
Well, those are the only ones listed on ANN that I've found, but there's a good chance he may do minor roles later in series, so I'll keep my eyes/ears out.