I'll introduce our multi-waveband study of the Coma galaxy cluster, in particular our HST/ACS Treasury Survey which was awarded 164 orbits in Cycle 15. I'll then discuss early results from both the HST data, and from a large MMT/Hectospec spectroscopic follow-up program started in 2007, focussing on the metallicities, ages and abundances of the Coma dwarf galaxies.