Here's some text to speech software that looks interesting that may be good for turning articles to audio for use in videos, etc. I haven't tried it (yet) but it's only $9.95.

http://imagestopdfconverter.com/image2pdf/text-to-voice.html

"Text to Voice Converter Software converts word documents into WAV audio file. You can record PDF, Word, plain text, PowerPoint files, web pages, and convert them to speech automatically. Word to Sound Software record books, articles, web pages, official papers, class notes or any other text content you want to have available to you in audio format. It is also a great way to check your writing for grammar and spelling errors. Text to voice converter program is able to reads all text documents including eBooks, news, web pages, RSS feeds, html, clipboard, PDF, word, excel, rtf file, plain text, email, etc"