I've always wished we had a way to leave clues for others who come along. The ability to write notes on paper (or carved into stone. Even something like the ability to have something face right or left, or to point right or left would make going through labyrinths so much more amazing.) I would love to tap legends mode directly through links in-world, more than conversations. To actually put words to paper or actual notes, rather than their abstraction. How amazing would it be to be able to place a cairn of stones over fallen comrades in an adventure, or even carve a memorial that told how a companion died? "Here lies Urist McDragonsnack, Champion of the Velvet Temple, Slayer of giant thrips and meat shield to Player McCowardlyrunningaway. May he rest in peace as well as in pieces..."
To be able to write an adventurer's story in-game, to be found and read in-game. That would be awesome. (I'd settle for an in-game url to these forums that leads to the tale told in that manuscript. Imagine, though, leaving links to outside game resources to be found within the game... making Dwarf Fortress a hyperlinked game, so that it and the forums are one. Red herrings in game can also be linked here. Music, pictures, prophecies (unofficial games) and plans for fabulous constructions... What a game that could be!)
I suppose if we could have x,y and z-level of an adventurer, and some kind of marker could be placed such that Players looking up that co-ordinate on a list of links could then find out what was left there in information. Perhaps named weapons, or other items of the same nature? Will artifacts stay where you've dropped them out in the Wilderness?
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Incidentally, I might have to set up a series of pilgrim's way-stations to assist religious pilgrims (and thier bodygaurds) along thier path to the Holy Museum of Wonders... Got an awesome Perfect World map for you to use if you like: The forty islands of Dwarfopoly