1. Introduction  
2. Observations  
3. Results  
4. Discussion  
4.1. Background Sources  
4.2. Radio Properties of the YSO Population  
4.3. The Radio – X-Ray Relation  
5. Comments on Some Individual Sources  
5.1. VLA 1623  
5.2. Radio Detections at the Stellar-Brown Dwarf Boundary  
5.3. Non-Thermal Radio Emission from Class I Objects  
5.4. GBS-VLA J162700.00-242640.3: A New Calibrator for Ophiuchus  
6. Conclusions and Perspectives