Yet again, the financial services category accounted for the biggest chunk of online display ad impressions, followed by web media.

In July, financial services accounted for 25 percent - yet again the largest proportion - of online display ad impressions, up slightly from 24 percent in June and 21 percent in July 2005, reports MediaPost, citing data from Nielsen/NetRatings AdRelevance. Web media accounted for 18 percent, unchanged from the previous month and last year; retail goods and services accounted for 17 percent, compared with 16 percent in June and 14 percent in July 2005.

Though online ads for movies and TV have generated buzz, the entertainment category constituted a mere 3 percent of online display ads in June, unchanged from January. Within the category, MySpace.com parent News Corp. accounted for 15.3 percent - the largest proportion.

Yahoo Mail was again the most popular venue for online ads, accounting for 32.9 percent; MySpace accounted for 18.7 percent; MSN Hotmail was third with 7.0 percent.

Prior coverage:

- Financial Services Extends Lead in Online Ad Impressions
- Financial Services Up Online Ad Spend