newsrdr now has browser extensions available!

Chrome: https://chrome.google.com/webstore/detail/newsrdrus-checker/bnchcmdgmdfnhelmcfaebjiggnldiedf?hl=en&gl=US
Safari: http://newsrdr.us/extension/safari/newsrdr-checker.safariextz
Firefox: https://addons.mozilla.org/en-US/firefox/addon/newsrdrus-checker/

Basically, as long as you're logged into newsrdr, the extension will show a button in your browser's toolbar with the number of unread posts. It also provides an easy way to log into newsrdr: simply click on the button.

Let me know here if you run into any issues.