If you live inside your e-mail inbox, then this idea might really appeal to you: replying to comments via e-mail. No more logging into your WordPress.com dashboard, instead, you can now reply directly to a comment notification through your e-mail and it will be posted live on your blog.
It requires a few settings to be changed, but a recent blog post and video on WordPress.com will help you better understand the process.
Two things to enable this feature. First, make sure email notifications for comments are turned on. Second, select the ‘Enable sending comment replies via email’ option. All of these items are on the Settings > Discussion page.
Go ahead and give it a try, and let me know what you think.