Yeah, I have difficulty writing stuff that's completely gen - I find myself hinting at pairings (Sam/Jack, mainly - I'm so predictable). But I might try and restrain myself - partly as a show of support, and partly because I'm curious to see if I can. :)

And yeah, I'm very glad that neither HP nor Supernatural appeals to me. *pokes them away with sharp stick*

...I'd say 'in', personally. Sam's in Atlantis... it just... sounds better, to me. *shrug* I don't know, really. Probably you could do both, but I'd find 'on' a little more noticeable.