(oh, and Mark, did you check out this thread? It has a lot of Aslan's thoughts about his chronicle, so if you want to hear some of the plotline... I think it should be there. Or you may have seen it already and want more!)
Well thank you for the reminder post
Not sure how much will find its' way onto the webpage in the end, but perhaps a nice timeline and the Journals of Willow Brandybuck
Characters stats...maybe at several phases of progress over the life of the game. It would be neat seeing them at the begining, and very 20-25% of the way through.
Names and ideas of the NPCs.
Monsters and item stats.
Places, locations and other things visited.
Timelines.
Adventure plotlines/summaries.
Journal's made by the PCs, if any. Or at least an occasion PC "POV" on places or people or things.
A quote page of the best quotes that come up in the games.
What Mark said looks like a lot to get started with, and I'm sure more will come to you/us. Especially go with the quotes suggestion, that sounds good!
Perhaps narrations of the events as well, rather like the Ice & Fire chronicles on sauron.misled.us by Jason Durall and company.
Also, it'd be interesting to see any thoughts you and your players have on how the rules will work or are working, and what you think about them later. For example, you might think a certain mechanic doesn't look like it would play smoothly, and then after you've played it you can tell us whether it did run smoothly or not, and then later when you've used it several more times you could tell us your 'final thoughts' on the matter, and possibly fixes (if it actually does need to get fixed).