Welcome to WebmasterWorld Guest from 220.127.116.11
Forum Moderators: mademetop
Welcome to WW (just in case no one said that yet).
Here's the trick: There is no trick. ;-)
The SE's like to find your site by crawling the Web and following links from other good sites that link to your site.
WRT to G site maps, they can help G 'know' which pages you think are more important or need spidering more often, but as far as getting featured in the SE's, getting great inbound links from quality sites is the best way to go.