OK I fixed my main issue. I wasn't able to have my plugin loaded by Jetbrains Omea, and it seems that it is linked with the .NET Framework 2.0 that I use in my plugin, even if Omea Reader is running using .NET Framework 2.0 somehow it can't verify the plugin.
I had to install MSBee so I don't need to install VS 03 again. And now back to the old days of command line I have to compile using such a command:
I just finished the first release of the plugin. Now you are free to download the source from Codeplex on this page.
That's my first plugin for Windows Live Writer and it will be published on Codeplex in the project Windows Live Writer Plugins.
Here it is how it looks like in Live Writer: