Here's a refreshing article by a seasoned writer that can probably do a lot to help make the web an easier place to get information for users and a better place for companies to disburse it.
I know the article isn't technically by a designer, but AIGA was one of the last places I expected to find copy advice. I'll certainly be looking for more there.
I think it's also good to note that some more technical products will always need a great deal of content. There will be people pining through technical specs and legal disclosures for industries like banking or technology. However, I still think it's a good guide for the primary content of a page. You can put technical charts and details further down after covering the top-line items briefly to actually assure your audience is interested before berating them with the nitty-gritty details.
All in all, good advice.