1. Introduction
2. Spitzer IRS Data
2.1. Sample Selection
2.2. Observations and Data Reduction
3. Results
3.1. Background Sources
3.2. Embedded Sources
3.3. Disk Sources
4. Discussion
4.1. Cluster vs. Field Population
4.2. Comparison with Other Samples
4.3. Comparison with Taurus
4.4. Implications
5. Conclusions