Release delta updates rather than full file downloads
I love Proclaim and it has some awesome features, made possible by a really regular release schedule. Obviously the side-effect of this means very regular updates to download. Currently, this means ~150MB a time - and my internet connection is OK, but at peak times this takes quite a while.
I was thinking it would be great if you could implement some sort of delta updates, so you only ship what's changed. Not sure of the technical implications of doing this but even from the point of view of your EC2 bill with all these large updates so regularly, it's gotta be worth investigating!!