Akihabara was a total disappointment... maybe at night time it might be better (ie. more interesting) but we went midday/early arvo and it was just a crap load of shops trying to offload old crappy PC equipment, Few little stores with overpriced toys, camera stores run by some egyptian bloke with len's double what you would pay here in Aus.
If anyone is into Models or die-cast cars there was a shop that went over 2 levels chock full of them... inc. trains, BB guns (wish I coulda brought some home)