1. Introduction
2. Data from SDSS Stripe 82
2.1. Overview
2.2. Object Extraction and Pre-Ensemble Processing
2.3. Ensemble Differential Photometry
2.4. Classification of Point Sources
3. Variable Objects in Stripe 82
3.1. Extraction of Variable Point Sources
3.2. Finding Periods
4. The RA 0 h to 4 h Light-Curve Catalog
4.1. General Properties and Classification
4.2. Variable Detection and Period Recovery Efficiency
4.3. Obtaining the Light-Curve Catalogs
4.4. Periodic Variables
4.5. Variable Quasars
4.6. Non-Variable Objects
5. Conclusions