Online advertising continues to grow. A forecast from JupiterResearch says online ad spending will reach $18.9 billion in 2010, double 2004's expenditure.

Each category of Internet advertising will see growth. Display will increase by seven percent in five years; classifieds will grow about 10 percent to $4.1 billion; and rich and streaming media spending will grow to nearly $4.5 billion by 2010.

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