I found this excellent bookmarklet the other day which allows you to see nofollow links quickly and easily in Chrome most modern browsers.
The bookmarklet consists of the following JavaScript.
javascript:function%20highlightNofollow(){var%20newStyle=document.createElement('style');newStyle.type='text/css';newStyle.appendChild(document.createTextNode('a[rel~=nofollow]{border:1px%20dashed%20#852!%20important;background-color:#fcc!%20important;}'));document.getElementsByTagName('head')[0].appendChild(newStyle);};highlightNofollow();
Which basically puts the following CSS rules into your document, thus highlighting any links with the rel="nofollow" attribute.
a[rel~=nofollow] { border:1px dashed #852! important; background-color:#fcc! important; }
Take a look at the bookmarklet on johnmu.com.