I just submitted a manuscript to a computational biology journal, and during the process, I was asked how to classify it. Not being sure just exactly what computational biology is, it turns out that the website gave a handy little sub-categorization scheme for it, which clarified things immensely for me:

• Alternative Splicing
• Comparative Sequence Analysis
• Computational Neuroscience
• Ecosystem Modeling
• Genomics
• Literature Analysis
• Macromolecular Sequence Analysis
• Macromolecular Structure Analysis
• Metabolic Networks
• Metagenomics
• Molecular Dynamics
• Molecular Genetics
• Population Genetics
• Protein Homology Detection
• Protein Structure Prediction
• Sequence Motif Analysis
• Signaling Networks
• Synthetic Biology
• Systems Biology
• Transcriptional Regulation