“Keep updating your website contents at least once in a week, increase your website internal linking and submit Submit xml.sitemap to Google and Bing. Make sure you have defined robots.txt in the root, Create good number of quality back links"
I think off page optimization will give you quick indexing. In off page, Bookmarking is the best way to cached and indexed your pages. Google frequently crawl bookmarking sites, and in this process your page will get indexed. I have done it.
Also there are many other ways like article submission, blogging, yahoo answer, reviews, forum postings etc.
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Well to ge indexed in search engiens submitting your sites URL only is not sufficient you will also have to build back links for it, will also have to promote it uisng various methods such as SEO, SEM, Social networking sites, PPC etc.