I'm going through my rail network, replacing boosters with powered rails. However I'm finding that unlike boosters, which 'break' the laws of minecraft physics (by giving the cart much more momentum than its speed should allow), powered rails can't propel carts over very long distances, and it seems that even making a very long boost doesn't help this.
How should I cluster my powered rails for maximum efficiency? How many should I put at a time, both on flat, and inclined stretches?
I've un-answered this question and added a bounty to reflect the changes in 1.6.