The Last Days of the Third Age — a total conversion of Mount and Blade 1.011 and Warband into J.R.R. Tolkien's Middle Earth.
The fantastic screenshots were enough to make me redownload and reinstall Mount&Blade after, what, 3 years? It's truly fantastic, though because it uses the old M+B engine, the combat isn't very good (a great sub-mod exists for Warband combat animations, though it has some animation bugs and doesn't fix the terrible sword combat while mounted).
I'd give this mod a 10, but twice now i've reached a point in my campaign where the game will just crash at a certain point. The game is kind enough to make backup saves, but using those would still result in a crash once reaching a certain point in time in the game.
The new weapons and armour look fantastic, the new enemies look great and have a nice selection of sounds to go with them (grunts and...stuff), and the great new system of earning rank (and therefore rewards) with different factions is great fun, if a little grind-like and monotonous.
It's definitely worth downloading.