PowerPoint v blogging

I'm interested in the ways in which the use of PowerPoint orients and modifies the rhetoric of scientific oral communication. There was an excellent programme about this on BBC Radio 4 recently in which they did a spoof of Churchill's "We will fight them on the beaches" speech. "We will fight them on [hits the keyboard and bullet point n° one whooshes in] beaches. We will also be fighting them on the [hits keyboard again, second bullet point appears] landing grounds." etc. (If anyone has a recording of the programme please let me know, it's disappeared from the BBC's online archive). Anyway, here is a business blogger's take on blogging v. PowerPoint Brand Autopsy: "I’ve been blogging for just over a year now and besides keeping my marketing mind sharp, blogging has helped me sharpen my writing skills. (Or so I think.) The years of writing in succinct bullet-points for PowerPoint decks adversely impacted my writing. Blogging, albeit informal in nature, has helped me to improve my writing skills. And as a result of writing more, I’m finding myself using PowerPoint less and less in business situations."