I guess by now every blogger knows about Entrecard. It’s simple, fast and free ad exchange network. All banners are in one size only: 125×125 pix. If you are new to this advertising method visit Entrecard for more info. (If you are already a member – feel free to drop yours on my graphics-illustrations.blogspot.com blog)
Another useful advertising network is Projectwonderful.com (also visible on my graphics-illustrations.blogspot.com blog).
More info on these advertising networks can be found on their respective web sites. If you still don’t know about it – I can highly recommend them.
Since today’s post subject is Entrecard and Project wonderful: I bring you the standard banner images “Your Ad Here”, 125×125 size tailored for Project wonderful usage (like the one I have on graphics-illustrations.blogspot.com) and they’re FREE: