1. INTRODUCTION
2. SCOPE OF DR8
3. IMAGING DATA
3.1. Improved Sky Subtraction
3.2. Improved Sky Subtraction in Post-Processing
3.3. Photometric Calibration
3.4. Resolving the Imaging
3.5. Differences in Astrometric Calibration
3.6. Galaxy Zoo
4. SPECTROSCOPIC DATA
4.1. SEGUE-2 Target Selection
4.2. Spectroscopic Classification and Redshift Measurement
4.3. Quantities Derived from Galaxy Spectra
4.4. Changes to SSPP
4.5. Spectroscopic Data Quality
4.6. New and Reprocessed Plates
4.7. Matching Photometry to Spectroscopy
5. DATA DISTRIBUTION
6. CONCLUSIONS