Star cluster M44. The shot was taken at Sounio.
Canon EOS DIGITAL REBEL XT, Modified + Peltier cooled, SW ED 80, EQ 6 mount, 6/2/2011 3:48 – 4:38, Shutter Speed 7 min x 6 shots + flats, darks, Aperture Value 7.5, ISO 800, Process: Photoshop CS2