1. Introduction
2. Observations and data processing
2.1. Description of data set
2.2. Correction of the PSF distortion and implications for the star/galaxy separation
2.3. Template main sequence function
2.4. Uncertainties in the turnoff point
3. The Sagittarius stream
3.2. Comparison with models of the Sgr stream
4. The Palomar 5 stream and the Orphan stream
5. Conclusions