Over at PS Publishing, there are a host of free samples, including one from Mystery Hill (which is expanded from the version that appeared in F&SF last year). SF Signal has the list of the other available samples. I'm off to check them out.
And by the way, I've got another novella coming from PS sometime next year (I think). It's called Mare Ultima, and is a substantial expansion of two stories from F&SF--"Wizard's Six" and "Dragon's Teeth" (the latter forthcoming).