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Originally Posted by deepsand
But, is it the submission to DMOZ, or the acquisition of a listing there that triggers a crawl?
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To my knowledge when and if you're application for listing in DMOZ is reviewed and approved and the site listed it is then added to Google's search results and crawled. I don't know if the crawl is triggered to include the site or if the site is added to Google's SERPs prior to the initial crawl. Best guess is that years ago it was just added to the SERPs then crawled but now and for a few years now the addition of the listing in DMOZ simply triggers a crawl.
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BTW, SEs do not passively wait for IBLs to evidence the existence of a new domain. In particular, as a Registrar, Google can very quickly learn of such by actively monitoring registration data.
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They used to have to .. but yes now they are learning of new sites through many many sources...
There was a day when it would be weeks or months between crawls, but upgrades in technology over the last 5 years have enabled Google (and others) to be able to crawl sites with greater regularity and index new sites within hours.
In today's Internet I find waiting for registration data, site can take a week or two to end up in the SERPs; Submit sitemap, a few hours; Couple of good IBLs same or sooner (had one site we uploaded, submitted video to youtube... googled and the site was there... total about 1 hour from upload! Blew me away! I don't think that's the norm though.
Heck, we used to get paid just to get a site listed on a search engine, forget ranking well! LOL