Ever since I’ve installed Ubuntu 9.10 I have been searching for a good alternative to Windows Live Writer. The closest thing was BloGTK but it lacked many options. One of the biggest flaws was that I wasn’t able to assign categories to my WordPress posts. It seems that BloGTK was really designed mainly for Blogger.
Right now i am testing out ScribeFire which is a Firefox add-on and I am happy with it. I still consider Windows Live Writer to be one of the best blogging client.