Financial services companies increased their online ad spending last month--purchasing 30 percent of all display impressions, according to Nielsen//NetRatings AdRelevance. One year ago, financial
services marketers were responsible for just 20 percent of display ads online; last month, they purchased 28 percent of display ads. Telecom marketers also upped their online ad spending
year-over-year--accounting for 17 percent of impressions last month, up from 12 percent last year. The third-largest category of advertisers--retail goods and services marketers--purchased 15 percent
of impressions in April, up from 14 percent in April of 2005. -- Wendy Davis