When people backlink - they leave links on this special site or that high PR site. After they leave it, they go to the next site and leave a backlink. They forget all about getting the page indexed where they left the link. This is very important - if it doesn't get indexed - it doesn't do you any good. Yes, eventually, the page that you left your backlink on will eventually get indexed - but it may take a few months. Some people, seeing this, turn to pingomatic or pingler to get these pages indexed - or they may even social bm the page. I can only say from my exerpierence, that this rarely works for me. I'm pretty impatient, so I try a different approach. If I want a page where I left a link on indexed quickly, I've found that I can do it two ways. Let's say I create content on a new web 2.0 property and it isn't indexed yet. I would leave a sig link on a high traffic forum and see that it usually becomes indexed a lot faster than if it was bookmarked or pinged. Another way is this. I have a website "in the harbor" that has a PR of 3 that the Googlebot visits quite often. I would leave a link or two to a Web 2.0 property, and it would get indexed rather quickly. In fact, it's better than when I leave sig links on high travelled forums. Anyway, that's my advice and personal experience. I hope this can help someone. I'm open to any comments or suggestions...
Dude, when people are building links from any page they always make sure that the page is indexed and have some PR. E.g, while blog commenting, nobody leaves comments on non indexed pages. Links from any page is more like links from directories - never get crawled !
I take all the links I make and put it in one of my blogs. Also I slap it in a text file and upload it to scribd.