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"Until recently it was assumed that specialized software was required to do concordancing, but it turns out that a search engine such as Google can generate queries into almost limitless corpora (using the Advanced Search feature from the main portal page, for example). This paper by Tom Robb addresses more refined issues regarding the integrity of the data thus derived, and how we might improve on the integrity of that data through more defined searches, as explained here. "

WebCorp - uses the whole internet as a corpus. Can limit by domain, language, etc.