Remember the talk we had from our US visitor regarding a theory of 'stages' of understanding? It's neatly summarised here, in an interesting article about writing for adult audiences.
This whole website - Museum-Ed - is excellent. It collates museum education documents from various institutions (mostly US) and is a mine of information about conferences, training info, education guidelines, etc. And very easy to navigate :)
Funny title, interesting article. A good round up of (relatively) recent shifts in educational practice that have strong implications for learning in the museum. It's by Anna Cutler from the Tate, who gave one of the interviews in the 'Tate Encounters', posted by Sheona below.