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This is one of the things that Stack Overflow and the rest of the sites that run on this platform do very well. As soon as you try to create a new question, a little window is shown that shows other similar questions. How is this done? What technology can be used to achieve this? Lucene, Sphinx, ...?
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StackOverflow (and StackExchange in general) uses Lucene.net for full-text search.
Might want to read this as well.