kate-editor.org now contains all articles from the old page still applicable to Kate in KDE 4 and in addition all blog entries of Dominik which are Kate centric.
Beside that it will aggregate the blog entries of Milian for Kate ;)
Still, a lot of work is needed. We already got an offer for help to beautify the page by a web designer, still content writers are missing. You have a nice short post about how to use Kate best? You have some howto? Just contact us or me in private. We can either give you an account on the page or just add your content if you like that more.