There is no satisfactory blogging clients in Linux, at least for me. Not yet. I have tried GNOME blog entry poster, Drivel, and Blogtk. Each has its own strengths and weaknesses. For example GNOME Blog Entry Poster supports Blogger.com (which hosts my other blog), but has poor WordPress support. It cannot choose categories, for example.
Drivel support categories in WordPress, but cannot add it. And it fails to log in to Blogger.com. I tried Blogtk for a while, but decided against it when I found out it was no longer maintained.