The Mindcraft work is a video game. Students could create a Castle from nothing and then they used screen-capturing software to record a tour of the castle they made. Others used prezi, powerpoint, podcasting, voki's, blogs ect. I can put them all up but a few to show you.
Some links first:
Prezi put in online book (part way down page): http://dgh.wikispaces.com/Middle+Ages
BLog copied and pasted and added to for the online book: