1. INTRODUCTION

2. ALFALFA OBSERVATIONS AND DATA ANALYSIS
2.1. A New ALFALFA Catalog of the Region $09^{h}36^{m}<\alpha<11^{h}36^{m},+08^{\circ}<\delta<+12^{\circ}$

3. STRUCTURE AND DYNAMICS OF THE LEO GROUP
3.1. Group Membership in Leo I
3.2. Primary and Secondary Distances in Leo
3.3. Group Membership in the Leo Cloud
3.4. Velocity Dispersion for Leo $I$

4. COMPARISON WITH THE KK04 OPTICALLY-SELECTED CATALOG

5. HI MASS FUNCTION FOR LEO I
5.1. Completeness Corrections & Error Estimates
5.2. The Leo I HIMF & Comparison with other HIMFs
5.3. Comparison with Luminosity Functions

6. CONCLUSIONS