Rich Edwards asked what API details to use when posting from Writely to a knotes blog... The details for your own blog are given in the 'Set up external weblog management' link from the Manage or Contribute sidebar (you only see this sidebar when you are logged in to a blog you are allowed to contribute to).
Log into the weblog you want to set Writely up to post to, anc click the 'Set up external weblog management' link from the Manage or Contribute sidebar. The details are given there. The Movable Type interface is generally the best, if the option is given to use it.
KNotes supports auto-discovery of its API hooks, so some blogging client programs only need to be given the url for the blog itself and will fill in the rest themselves.
Hope this helps!