To help speed up the load time of your prototype.js and scriptaculous pages, you can now download fully compressed versions of all the required files from the ‘prototype-core’ group on google thanks to John David-Dalton (original post on Ajaxian):

http://groups.google.com/group/prototype-core

This reduces the size of prototype and scriptaculous to 64k total! Be sure to read the included documentation, but this can make some serious difference to load times – particularly when clients are on slow connections.