Current Centos DVD ISO is ~4.3GB! A frickin' server distro with a 4.3GB iso.. why.. just why..
Packs
They've crammed like 4 complete desktop environments + all the accompanied accoutrements that are DE specific into 4.3GB. The 'everything' iso is frickin' 10GB.
My latest Debian .iso live-build compresses from ~2.5GB to ~810MB with hardly an GUI components. Dang, I just though of a few tricks to get that build size down a tad.