The methods listed above can work. But they probably wont.
You have to give the person a reason to link to you.
I guarantee you, any commercial site, or established site, is not going to ever link to you just because you asked nicely.
The best way is to have content that people will need to link to.
The next best way is to buy them. Do it in a clandestine fashion, just to be safe.
There are plenty of methods of finding link sources, but in order for you to finagle your way into getting a link, the site has to have content that is at least equal to the current content available on the web (i.e. the content that the websites are linking too)..
In some areas its easier to get webmasters to give you links, to pay for them, to use linkbait (Top 10 Blah Bla Blahs).. In some areas its more difficult, i.e.: people aren't willing to sell off the integrity of their site.
To take a concrete example, theres Wikipedia... Not only does wikipedia have the most extensive interlinked website on earth (with anchor text galore for every term imaginable), it is the ultimate link bait... If you need to link to a page in order to explain something, there is a wiki article on it.
So mirror wiki, both in content (don't actually use their content, that will lead to duplicate content penalties) and in linking structure...
to be frank, guy, I don't think any established website will link to u if u camnot offer them better.
well , all the suggestions other guys, offer you could try them on.
maybe u could focus on relevancy and unqiue but quality content.
NO oe deny that!