Testing Flickr’s ‘Blog this photo’ functionality – you just click on an image you want to blog about (yours or anyone else’s presumably), and if you’ve set up Flickr properly, you can compose a post on the Flickr site, and it will add in the photo and send it to your blog.
Doesn’t look like to can assign categories in the default setup, so you might be better off composing the post in your favourite editor (MarsEdit) for me, and pasting in the link to the Flickr photo that way.
But still a useful tool, for off the cuff posts. But you’d need to watch our for blogging on other people’s photos – technically you could argue that’s fair use, so it’s OK to put their photo on your blog. But you should definitely include links and copyright information, and ideally be blogging about the photographer and their work, not just using their photo to illustrate your post.