Organizing a messy page full of logos into an neat grid can be a pain. Most of the time, I use a simple PowerPoint table to do this. Figure out the required number of rows and columns, draw a table, reformat to a white background with very thin grey separator lines. Now you can plop in the logos in the right position, and best of all, if you have to insert/delete rows/columns, the grid gets adjusted in a second.

(An earlier post about designing good logo pages)