Widow Fix is a jQuery plugin to fix widows, or orphans, or whatever you call them—those single words on their own line. It does this by adding a (non-breaking space) in between the last 2 words.
Another related script is Widow Tamer by Nathan Ford mentioned on http://artequalswork.com/posts/on-widows.php which is pretty sweet too.
Available in bower as jquery-widowfix