Sucodo is a pretty nifty web service that lets you check plagiarism in text content.
The service uses a web search engine to locate similar content on the web and highlights the portions in your submitted content that seems to be copied from other sources.
Content that is found to be copied from other sources is highlighted and you can check the original source of that information.
This tool is useful for teachers and web publishers who have to review content submitted by students and content writers.
The developer behind this tool has just revealed that the service is now using Blekko engine instead of Bing which it was previously using.
— Manuel Rülke (@homecoded) July 14, 2012
We played around with the service and found it to be pretty accurate.