You don't have RSS feed on your website?
https://github.com/ryanb/railscasts/blob/master/app/controll...
https://github.com/ryanb/railscasts/blob/master/app/views/ep...
That's all you'd need to do. Oh, and if you submit your feed to http://feedburner.com/, you can hand out their URL instead, and you'll get stats and stuff.