With 1.9.0 it worked for me (and many other people in our site).
Using BloGtk (for GNU/Linux), or wBloggar for M$ Windows.
Posting worked ok, except that on BloGtk and other soft. on GNU/Linux didn't add the title of the post manually (it did, if we added manually between html tags for title and /title.
For wBloggar, titles went ok, but utf-8 is not fully supported by wBloggar yet.
Posting worked on them, editing them or other features via xmlrpc never worked for me.