I am not sure if you are using Windows OS or not, but I use BlogDesk. You can load as many blogs into it as you want. I don't ever have to open up a wordpress backend to write posts ever. You can format the posts based on your blog theme with a template maker in the software and save the templates based on the blogs. You can even add info for custom fields if need be for Wordpress Tube themes etc. With this you can also change the dates of your posts. So if you write 10-20 blog posts at one time. You can spread them out over dates in wordpress and it will automatically post them when you want them to be posted. You can also edit your photos with it. Saves me a shitload of time. You should check it out.
www.blogdesk.org