All digital advertising segments - display, search, rich media, DVR, in-game and mobile - will grow in the next five years, reaching $23.5 billion in ad spending, according to analyst firm Parks Associates, writes ClickZ. Digital media will account for 10 percent of overall ad spending in 2010, Parks forecasts, saying in 2005 digital media accounted for 5 percent, or $9.45 billion.

The internet display ad category is expected to grow at a four percent compound annual growth rate (CAGR), reaching $2.4 billion by 2010; search is expected to grow a 14 percent CAGR, reaching $9.7 billion.

Ad spend for newer categories such as rich media, in-game, and mobile advertising, starting from a lower base, are expected to grow at higher CAGRs: rich-media, 31 percent, reaching $5.7 billion; and in-game advertising, 50 percent, reaching $432 million. Mobile advertising is forecast to reach $2 billion in 2010.