how to build your web site so that search engines would love it?

SearchEngineWorld guide

google webmaster guidelines

how to find people?

create a web page with names of friends and colleagues whose contact information you desire. On the page, ask these people (or anyone who has their contact information) to get in touch with you.
When these people search for themselves, they may run across your page and get in touch with you.
Quoted from the excellent GoogleGuide

how to find mp3's with google?

http://www.geocities.com/my_haz_runs/