BrowserShark is intended to be highly visual, so Banner advertisements are the primary means of representation used.

Banner advertisements have several industry standard sizes, designed to fit a variety of placement opportunities. Of these, the most effecient and effective for use on BrowserShark tend to be the Rectangle and Square types.

BrowserShark is primarily designed to utilize:
Medium Rectangle - 300x250px
Small Square - 250x250px

Also acceptable are:
Large Rectangle - 336x280px
Medium Square - 300x300px
Large Square - 400x400px

Other sizes can be used, but are less desirable esthetically speaking.