Adjust row width and column height (important for "LONG" numbers)

Change format of cell contents (e.g. number of decimals displayed, date format)

Change font (size, bold) of text (e.g. for worksheet titles, column headers).

Change alignment, including text spanning multiple columns, and wrapped text.

Manipulate cell borders for individual cells and for regions of cells.

Change color of cells (fill color).

From http://math.la.asu.edu/~kawski/classes/mat272/EXCEL/EXCELskills.html