The New York Times writes about the growth in online advertising:
For now, classified advertising makes up roughly 60 to 70 percent of online advertising for newspapers, Mr. Bennett said. At the same time, Web sites like Craigslist that offer free classifieds are luring advertisers away from sites that charge to place ads.
One hope for online newspaper classifieds is the control their staffs can exercise over the content, unlike free sites like Craigslist, which are mostly managed and edited by anonymous users.
In addition to classified ads, other opportunities for growth in online advertising include interactive ads, wallpaper ads and ads with streaming video or audio.