Ignoring the obvious Tony & Ziva Pairing up or Abby & Tim, what sort of story line would you like to see? For myself I would like to see a flashback episode showing a young Gibbs as a US Marine in some sort of adventure perhaps during desert storm.

That would be great! I'd also like to see a Gibbs/Ducky flashback of them working together at the begining of their professional relationship! The way Ducky talks about those times it seems like they had some very interesting cases together.

I'd LOVE to see a flashback episode about Ziva's life before NCIS (she's my favourite character).
I'd like to see Tali, Ziva's mother, Ari, Eli, even aunt Nettie! :P
I think there's a lot about her that we don't know yet and I'm looking forward to an episode like that.
If Eli comes back in season 8 we could hope to know something more...

That would be cool. I'd like to see Duckie's life too any of them really. What about Palmer? It would be nice to see anything about Gibbs life that we haven't already seen. Even if he told about it and it showed it as he was talking.

I'd love to see a flashback of when Gibbs & Abby first met. =]

Flashback of how Gibbs team met

I would love to see a flashback of Gibbs has a child like 9?

i wouls like to see tonys life with his father and before ncis and i think they should hav an episode where jeane and tony get back together and they show flash backs of their firat relationship