That's alright. We have an idea of who they are. :)

I do remember it was a long list. We had several episodes in advance planned. 
For the episodes:

Nine/Jen
1. Berlin (Current)
2. 42
3. Empty Child/Doctor Dances (Everybody lives. Just this once, everybody lives :) )*
4. Beast Below 

Ten/Summer
1. Christmas (Current)
2. Shakespeare
3. Midnight*
4. Blink*?

*Ones I added.
(though I believe Blink and Midnight were both planned. We were talking about using Blink for Summer).

Ones that would be fun to look at:
- Pompeii 
- Doctor's Daughter (Ten and Summer?)
- Dalek (Nine and Jen?)
- Impossible Planet/Satan's Pit 

Crossover:
I think I just remembered something - Crossover had something to do with the Cyberman.
Three universes: - The cyberman from one, Nine/Jen from another, and Ten/Summer from the last. (Not exactly sure about the third universe or what we were planning).
I think that might be a good crossover and doing Cyberman would be pretty fun.
- Both TARDIS's accidentally get knocked into the Cyberman universe (Like in "Rise of the Cyberman").
- Jen and Summer run into each other first (?)
- They all meet up and track down the Cybermen and defeat them.
Though Nine and Ten in the same room.... This is going to be interesting... :D