When I change slug, will WordPress create redirect from the old URL?

I just went and tested this (WP 3.3.1), the wordpress core will automatically do a redirect if you change the post slug, even if you change the slug from post-a to post-b and then to post-c, post-a will return a 301 to post-c. That said, the redirection plugin that Mike Jolley recommended is an outstanding plugin and a great way to monitor for 404 errors and such.

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