have been pondering on the horizontal slice (vs. vertical slice) since reading sam's post and replies last week. coincidentally, we're implementing this at work off of @joewintergreen.com 's advice and knowledge of half-life 2 having a big linear dev hallway in a leaked build with placeholder beats
In fact building a single slice of a cake is 10X harder than building a cake! The HORIZONTAL SLICE though, that makes sense and is how we roll.