(Use the arrows to move!)
I've not seen any real tutorials for AABB yet (Forgive me if I missed yours!) so here's my attempt.
(This was as much a learning exercise for me as it is for others)
Tell me what you think! Should it be more interactive? Is getting people to look at the source too awkward? Does the tutorial explain enough?
Hopefully it explains more than that mozilla page we're all led to.
(https://developer.mozilla.org/en-US/docs/Games/Techniques/2D_collision_detection if you're interested)