From kponsen:
-language selection for registered users
-extend stats for admin
from country
browser
total visitors
top 10/25/50/100 referreres
operator systeem
-mobile version (like iphone or android or ipad)
(flash is not support for apple devices)
-user point systeem
every user gets his own registery link so he can invite friends and collect points with enough points he can redeem them for premium account
-more advertising spaces
so every banner come on one list and shown random on all advertising locations
-let advertisers buy there own banner
so a loss page for buy advertising spaces
more sizes available pay for x views or pay for x clicks