When i was new in the world of internet, i tried my hands on free website/wapsite/webspace providers. Ofcourse i used to do it for pleasure and getting even a single visitor was a big thing for me. I used to read articles by fellow wap/webmasters where they unleashed the secrets of getting huge amount of visitors. To the top of the list was "Adding site to google/search engines" and it holds true even now. Later i heared about the "blog" trend which was going on web. I got a free webspace and hosted a wordpress blog there. I tried couple of times adding my blog to google and other search engines but couldnt find even a clue about my site in those search engines. I gave up and started adding my blog to directories and some of them accepted my site. I even added my blog to some of the social bookmarking sites and blog communities. About a week later what do i see? my blog is indexed by google and other search engines. I was surprised, when i manually tried adding my blog to search engines it was not included even after a month but when i added it to directories, social bookmarking sites and blog communities, asap they include it !.
Surely there was some mechanism after this.

2 months before i tried to experiment a little bit on this. I created two blogs at blogspot.com, both were on different niche and i wrote 5 articles each for both. One was kept dormant but the other was added to social bookmarking site and blog communities. After that i added both the blogs to google. After a week the 2nd blog was included in search engines but the 1st one showed no sign.
What does this mean?
The search engines cosider how well exposed you site is on the web.
If your site link is present on some other websites, search engine may index your website when it comes accross your link on those sites.

So if you site/blog is new follow these steps to get your blog quickly indexed in search engines :
1)Make your site ready to be published.
2)Add it to social bookmarking sites, blog communities and directories.
3)Now add you site to major search engines or use ping tools.