Dossier de Presse is a Lightroom-WordPres plug-in from Luc Renambot:

I’m using WordPress with the NextGEN gallery plugin and I used to export my images to disk and then create a gallery and upload the images. They are (better) plugins to upload to WordPress, but I couldn’t find one that supported NextGEN gallery plugin. So I wrote my first Lightroom plugin, “Dossier de Presse“.

It allows you to export pictures directly to your WordPress blog. It supports NextGEN gallery and WordPress Media library. You can optionally create a post including the exported photos (the post is left in draft mode, so you can edit it later).