Apimac has released Clean Text 6.5 (http://www.apimac.com/cleantext/), which is now available on the Mac App Store. It costs US$19.95 and can be found in the Productivity category.
Clean Text is a Mac OS X tool for eliminating all text formatting issues. It performs such functions as removing empty lines, removing unwanted spaces, removing tab characters, converting smart quotes, tabs, returns, and more. A new Quick Clean action in version 6.5 lets you solve the most common cleaning problems of text found in email messages, documents and web page with a single click.
Clean Text 6.5 requires Mac OS X 10.4 or higher. It’s Universal Binary so runs natively on both PowerPC and Intel Macs.