There's a reason that I mentioned that these are my ten things.
I want to see your list! I want to see what other people think are important for the "authentic D&D experience."
To clarify:
Your list is identical to my list except for swapping out psionics for the funky dice, and the caveat regarding whether it is a FRPG list or a trademark list.
To put that in list form:
1. Alignment - you gotta have it in there somewhere.
2. The core skeleton - HD, HP, AC, saves, attack rolls, and damage rolls.
3. A class & race system. With levels and XP. And those Tolkien Rip-Off races somewhere.
4. Treasure. Shit-tons of treasure.
5. The funky dice, especially the d20 as the primary system mechanic.
6. Fighting Man, Thief, Magic-User, and Cleric (Fine, we'll go with Fighter, Rogue, Wizard, and Cleric). You can have more classes, you just need those ones.
7. The Paladin - they don't need to be a class, they just need to be there.
8. The doofy monsters - even though I've never used them, you can pry the Bulette and Owlbear from my cold, dead fingers.
9. The game is hands-off when it comes to stuff other than exploring cool places, avoiding traps, and killing shit.
10. The Two Key sources of powers: Vancian Magic, and Praying To The Gods For Powah.