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Recently they have some Flash or "rich media" advertiser stuff that loads in place of the entire homepage, which increases the load time on a 56k connection substantially.
Pop-ups and unders are one thing but to do what CBS is doing seems absurd. Do they command big bucks for that kind of placement? Seems like it would cause single access session to shoot up. It's one thing to be forced to watch a "rich media" (Flash, etc...) presentation about the site you are trying to enter but to have to sit through an ad for an entirely different site, well that's just crazy.
No doubt very irritating to users on dialup, but even moreso for users paying for access by the minute. Until widely used/accepted, this type of ad can really hurt a site.