Just Wanting to Know

I just finished Small Gods, which as of know is probably one of the best books I have ever read, right up there with Malazan I think, and I'm just wanting to know, does Omnia or Om ever come up in any of the other books? I've heard its one of the most self contained of the Discworld books, and the only other one I've read was Mort four years ago, maybe even longer now. Really getting into reading again now that I'm done with Malazan Book of the Fallen, so I think the next of the Death books is up next (Soul Music? Reaper Man? I have both I'll look that particular one up), as I loved Mort and Discworld and Terry Pratchett's writing is just so good. Still, I wanna know if Omnia and Om ever come up again, as I love them, and I sadly know that Brutha won't...