Here we have for tonight is a fan made short film about Dalek Caan.

Delving into Dalek Caan's timeline, this seems to take place from just about right after Daleks in Manhattan up to The Stolen Earth. It nicely postulates how some things might have occurred. And since there isn't really any other officially aired material covering the who's & what's whens in it besides the cracks that I know of, for me I'll personally take it and mentally add it to canon. Now that I think about it rewatching this post Into the Dalek, it does add another mental note to think about when it comes to contemplating Rusty and Dalek Oswin.

Fair warning, it is pretty much 99% ring-modulated Dalek talk if you find it grating.