[hugi]

Surfin' Safari (https://www.webkit.org/blog/) is another great Apple developer blog. I followed it religiously back when Webkit was leaving everyone else in the dust.

[frik]

Also, the Webkit Community Blog: http://planet.webkit.org

e.g. Adobe is contributing a lot of technology like CSS Regions

And Brent Fulgham maintain a Windows build of Webkit: http://whtconstruct.blogspot.com