if you're going for bar graphs, that's a pretty simple fixer-upper, make a 2 tone image about 30x5 pixels ( the 2 tone is to give illusion of 3d bar ) then do the math on the values you want and make the height of the image respectively reflect that value.
i remember coming across some documentation on how to use either excel or powerpoint in ASP in order to generate nice line graphs and pie charts, i'll have to rummage around to see what i can find