Quote Originally Posted by FriskyMatt View Post
What size banners are in demand now? What size do you look for to promote sites?
That's a tough question. I'm not sure there are any new standard banner sizes. Blog (vertical) banners are very popular right now. But even they come in such a large variety of sizes... 140, 150, 160 pixels wide and 400, 500, 600 pixels high and MANY MANY more sizes below, above and in between those.

As I said in another banner thread... just keep your options open by designing big and then resize and crop to the other sizes.