In 2007, search still owned the lion’s share, and grew to $8.81 billion. Display also gained more than $1 billion to $5.66 billion. Referrals were almost flat, still representing a niche, while e-mail classified dropped to less than $2 billion.

Online video, however, jumped from merely niche in 2005 to $1.8 billion in 2007, according to WR Hambrecht + Co.