I will present results from a new set of multi million particles simulations of the formation of individual disk galaxies in a cosmological context. I will show how improved resolution and a physically motivated description of energy feedback produce galaxies with realistic angular momentum content, the correct abundance of satellites and an ISM structure similar to what observed in nearby galaxies. Feedback significantly delay star formation in smaller galaxies, easily reproducing the observed antihierarchical age-mass relation. I will then briefly focus on new evidence for the existance of Dark Energy from the peculiar motions of nearby galaxies.