Many sites and blogs using the exchange of links, and that is good, because that Google use to rank your site or blog. But when it comes to driving visitors, they are not effective. In the best case, you bring a few visitors a month.
Unlike the links Google does not value banners a lot, but the banners will bring more visitors than the links, which will take more action, which is the main goal. According to my experience most efficient active banners 125x125 dimensions. It is best to place them in the said bar or on the bottom of the home page. I was surprised when I saw 2-3 thousand visits a month on a site where my banner is located at the bottom of the home page. When you exchange banners watch to be well-ranked sites, or blogs, which have a solid number of visits.
Active banners are much more efficient, because they combine text and images, and people who click on the banner are highly targeted visitors. Banner Exchange is not the same as the exchange of links, so do not exchange loads of banners, after Avila you do not have space to put them anymore, and your blog or site would be very funny in addition to many of banners and too many colors, plus they would take away the attention of the content on your blog or website. It is best to share up to ten banners and set them on the home page or side bar, and ask for that banner-partner do the same. It is best to combine the exchange of links to your Google ranked high, with the exchange of banners in order to receive a large number of visits.