Submitting sitemaps seems to be the quickest way to put sites on the big search engine's radar for crawling. Even though new sites are going to start with no content, the search engines will continue to poll the sitemaps as the wikis grow.
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My thinking for an implementation is to write this to hand off each of these to the job queue and have it fire these off whenever. Probably one job per search engine, as there will be auth tokens etc involved.