There are lot of file sharing site and you can index your site/blog quickly with them. I prefer you to use Scribd.com. You can easily get backlink and quick index by sharing your file on this site. If you submit your file today, you can see your site in search within 24 hrs. So, this is the best way to get quickly indexed in search engine.It is not important what you submit. So, you can submit any things that you want.
Link is here: http://www.scribd.com