Ann Althouse writes:
One thing about written blogs is you can glance over them quickly and decide how much you want to read. These podcast recordings impose their time frame on you. A slow talker forces you to listen longer. A slow writer doesn’t cause you to read slowly.
This is exactly right and I think helps to explain why video blogging isn’t the boon some people think it should be. The reader controls his entire experience; the listener controls some of it; and the watcher of videos, if he is paying attention, is more controlled by the experience than in control (a fact not lost on propagandists, which may explain why the likes of Leni Riefenstahl and Michael Moore tend to produce movies rather than essays). As a blog reader, I want to read what I want, quickly — not watch TV.
Video has a place on blogs, especially in reporting about tsunamis and other events that are dramatic and not abstract. But to watch some guy talk? Nah.
UPDATE: Ann adds, among other comments:
I agree here too. And this point applies in many areas, even ones as far afield as gauges on machines, and voicemail systems. Canned-voice feedback and voice-response systems are usually poor substitutes for the written word, and even for buttons and visual signals.
(See here for an old rant on a related topic.)