I understand that probably the best way to rent and show ads is by utilizing services like Adwords, but I've been curious about advertising directly by just contacting a blog owner or forum owner instead. Have any of you had any experience with this? If so, would you have any tips to share, and would you advise this over just advertising with Google or a similar service? I'd also appreciate even just a rough average of what the price could be. I know it probably depends on the site and its popularity, but I guess I'm just looking for an average price for averagely popular sites?