From IAB:

Internet advertising revenues (U.S.) for the first six months of 2004 were approximately $4.6 billion - a 39.7% increase over the first half of 2003. Internet advertising revenue totaled approximately $2.37 billion for the second quarter of 2004, representing a 42.7% increase over same period 2003. Q2 2004 revenues represent a 6% increase over Q1 2004. This report replaces the previously announced Q1 2004 estimate of $2.27 billion with the actual of $2.23 billion.

	2004 Q2	2003 Q2
Search	$947M (40%)	$481M (29%)
Display Ads	$474M (20%)	$382M (23%)
Classifieds	$403M (17%)	$282M (17%)
Sponsorships	$213M (9%)	$199M (12%)
Rich Media*	$189M (8%)	$149M (9%)
E-Mail	$47M (2%)	$66M (4%)
Referrals	$47M (2%)	$17M (1%)
Slotting Fees	$47M (2%)	$83M (5%)

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PDF Download from MarketingSherpa that outlines 10 most common mistakes in B-to-B lead generation programs.

Poneman Institute survey on attitudes to advertising. Download file:

• Most Respondents felt strongly that banner ads are intrusive and interfere with browsing. Almost as many respondents indicate that banner ads were generally not tailored to their interests or tastes.
  
• Despite frustration with Internet ads, respondents are not willing to spend money in order to reduce ad clutter.
  
• Despite frustration over ad clutter, banner ads appear to be effective at getting people to browse and buy.
  
• Respondents prefer targeted banner ads over non-targeted ads as they found them to be less annoying, more relevant and more likely to induce an interaction than non-targeted banner ads.
  
• Respondents are more comfortable getting targeted ads that don’t rely upon PII.