Hi Bruno <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />

The holy dagger is in the thieves' guild, in Rob's room
VERY BIG SPOILER ON HOLY ITEMS

Did the dwarven king tell you about the armour and helm? Did you bring him the axe and letter from the mine?
VERY BIG SPOILER ON DRAGON ARMOR SET

Treasure maps; Larian/Silver armour-screenie-spoiler

In Nericon's garden, did you kill the frogs to get the portal? Ended up in a room with a pile of boxes? For the statue, you must have the book from the three cult followers standing just south of the garden.

You need the heart of the dragon when you get dragon armour; the dwarven smith will forge them together (though you can buy back the original if you end up with something worse). You can quick save when he gives the fixed armour to you, then quick load if you don't get something good when you identify it.