How many banners do you need for your affiliate program?

I just launched off my affiliate program and I only have two, high quality 468x60 banners for the affiliates to use and your main affiliate link. Do you think I need more banners than this? The 468x60 seems to be the most popular.

 

I prefer 468x60...they work the best.

I don't like banners that aren't that size

 

I think maybe I should add a 125x125 because they are probably the second most popular. What do you think?

 

Oh yah, those are good too

 

the most popular sizes are:
468 x 60
250 x 250
125 x 125
120 x 600
160 x 600
720 x 90

I would suggest having all of these available for toy affiliates.

 

200x200 and 100x600 are nice, yes more is good

 

Some coupon sites like the 88 x 31 mini-banners as well.

 

I logged into my Google Adsense account and looked at the standards that Google uses. I realized the 468x60 was obvious, but then I thought about the squares, rectangles, and towers. I figured if webmasters are building their sites to accommodates adsense ads, then they're considering the various sized areas that they'll be hosting them at.