You can work for link building in top 25 social bookmarking sites. Here is the link of most popular social bookmarking sites- http://seo4expert.blogspot.com/2008/07/most-popular-social-bookmarking-sites.html
my referrals haven't been great from YouTube. i have around 10 videos but only get about 1% that actually click the hyperlink at the beginning of the text description. but it's better than nothing.
and also if you don't do it properly there is a possibility of google ban for sudden type in traffic increase
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I use Youtube and have attracted dialy visitors. Results can be good if your offering content that others are looking for on Youtube
dont frequently submit on search engines, this could penalize you on SERP instead use a xml sitemap and submit that file. the search engines will crall that and submit on their search results for more information visit my website (on the signature) it is an ebook that will definatly help you on how to get web traffic for free, check it out. and good luck
What kind of videos are you uploading that get 100k views in a week? I thought only porn gets that? Also according to the chart you got 7000 visits from about 12,000 views? Is that correct?