I've been thinking of what I would want from my perfect OSR ruleset, and I came up with the following:
1 - A front end as crunchy as the players want it. Anything from Swords & Wizardry simplicity to ACKS styled skills / proficiencies, so long as they are all "on the same page" with the amount of crunch they want.
2 - A back end easy enough for the DM to run with minimal reference to charts, tables, monster descriptions, spells and the like. A one sheet for combat, spell summaries, monster summaries and the like would be ideal
3 - Whittled down to it's core, a DM should be able to run the game with a 8 x 11 sheet of paper, folded in half like a booklet (and of course, whatever adventure he is running). Oh, and a readable typset for that sheet. Shit, might need 2 sheets (which would make 8 pages)
4 - Players should have everything on their character sheet that they need to play a session. Spells, experience charts, attack charts - whatever.
5 - Spells should be simple enough to explain in 2-3 sentences. Anything longer means it's too damn long.
6 - A unified skill mechanic. I think Stars Without Numbers does this very well. I'd yoke it.
7 - There should be a Player's Section and a DM's Section in the rulebook. These would full explain the game rules and such, which would be referenced on the above mentioned sheets.
I'm open for more ideas. Not sure where I'm going with this just yet, or even if I'm going anywhere with it. I just know I want the job of the DM simplified behind the scenes so he can spend the time running the scenes.
Kinda brainstorming out loud as it were ;)