Compute mutual information of your sequence alignment. You can submit the data by pasting the alignment, or read it from a file. When the processing is done you can zoom around in your plot as much as you want. For pure sequence information go to protein sequence logos. For publication of results, please cite
MatrixPlot: visualizing sequence constraints. J. Gorodkin, H. H. Stærfeldt, O. Lund, and S. Brunak. Bioinformatics. 15:769-770, 1999.