If you have a WordPress.com blog and wanted to create another blog, you were required to create a separate WordPress login. Now you can create unlimited Worpdress.com blogs on a single login.
Matt at WordPress.com blog announced this feature.
“When you go to wordpress.com/signup as a logged in user, it lets you simply add another blog to your stable. As many as you want, need, or desire — no limits. You may also notice that when you’re logged in the WordPress.com homepage gives you a link to the admin section of all blogs that you have access to.”
It is a welcome feature to regular bloggers on WordPress.com who run multiple blogs. If you have multiple accounts, go to Users > Authors & Users > Add User From Community to make one of them an admin on both blogs. Become your blogs professionally now!