I would like to see support added for PNG banners. Gif image quality lacks tremendously, and swf files must be hosted by the merchant instead of by shareasale. Why not add support for uploading PNG files?

Advantages:

1. PNG 8-bit and 24-bit both produce higher quality banners in most cases, and with lower file size. All modern browsers support PNG. IE7 now supports 24-bit alpha transparency as well.

2. The increase in banner quality should increase CTR's and do a better job of selling the concept to potential affiliates.

3. PNG format works as a great alternative to using swf files. Some merchants either don't have the time to generate swf's or lack the ability to host them on their own.