... to start composing as the webfeeds keep rolling in ?

From Dave Winer's scripting.com:

Apple: "Safari RSS, a new version of Apple’s innovative web browser that provides instant access to the most current RSS information on the web." 

Apple also announced Tiger Server, which includes David Czarnecki's Blojsom weblog CMS bundled, an XML-RPC interface, as well as publishing content in RSS. 

Here's a really cool demo of their RSS reader. Based on squinting at this demo, it appears they did it right. It's not three-pane, it's one panel, with the items displayed, from all your feeds, in reverse chronologic order. This is the most efficient way to read for the user. A lot of designers think RSS readers should work just like mail apps, but that's too inefficient. With mail you need to keep spam and mail list content segregated. For news, you need a different interface. I've been saying it for years, the Apple designers apparently didn't get sucked into the design mistake so many have. One thing I wish Apple had done differently is respect the white-on-orange icon. Such a small thing, but so important. One would think Apple, of all, would understand the value of consistent user interface.