Cordy/Angel is my big BtvS ship, with Angel/Buffy and Spike/Buffy just behind. Spike/Illyria and Faith/Robin Wood(!!) are both ships I could have completely gotten behind if the shows hadn't ended.

Jayne/River were just a blast to watch, and there's that one moment in Serenity in the bar fight where you're kinda "did they just...they couldn't have...I think they did..." Any shipping, though, would be a good ways down the road...