Financial services companies accounted for 30 percent of all online display ad impressions in April, compared with 20 percent in April 2005 and 28 percent in March of this year, writes MediaPost, citing Nielsen/NetRatings AdRelevance figures. The total number of display ad impressions tracked by Nielsen/NetRatings increased to 197 billion in April, from 185 billion in March.

Telecom marketers accounted for 17 percent of online advertising impressions in April, up from 12 percent a year earlier. Retail goods and services marketers accounted for 15 percent of impressions in April, up from 14 percent in April 2005.

Web media, the No. 2 category last year, accounted for 13 percent of impressions month, with comparison shopping engine NexTag the largest spender - responsible for 18.5 percent of ads in the category.