Yesterday the REST tag showed a question count of around 1750.
Today if you go here http://stackoverflow.com/questions/tagged/rest you see 2027 questions.
However, if you go to tags http://stackoverflow.com/tags and search for Rest you see 2253
If I check other tags I do see small discrepancies between the numbers, but 200 questions seem like a whole lot. Could this have something to do with the synonyms? REST has a synonym RESTful and there are approx 200 questions with tags that start with "Restful".