Presto is a project that aims to utilize the work done on deltarpm to provide faster, smaller size downloads to Fedora users. If you're interested in helping, contact Jonathan Dieter
In Fedora, presto is installed by default. If it is not installed on your system, install it by running "yum install yum-presto".
Development code available from:
git clone git://git.fedorahosted.org/git/presto