If you are using both Firefox and Google Reader as your feedreader of choice then you might be interested in this tool to enhance your blogging experience. I realized that many bloggers, both new and old, might not be aware that this is even out there, so I thought I would mention it. It's honestly one of the very best things I ever did.
Using Firefox, download Greasemonkey
and then the Preview Enhanced Script
. Once you do this, you will be able to view blog posts from within the frame of your Google Reader and comment without ever having to open a new tab.