NoFP might be one place, but I know some other authors have him with the Unspeakables, too. The two-part "Unspeakable Truths" series being one of my favorites but it was a reference and homage to another fanfic writer (Rors perhaps?) as I know Keith used the same bit in one of his stories.
Author's response
I could be wrong. Unspeakable Truths sounds like a good read. I'll have to loo it up. I didn't' know Keith had a piece like that. I'll have to look it up too.
Alorkin