Async ajax calls, the key for the web2.0 search engines

The Ajax’s main feature is the async call possibility, it lets serve results without interrupt the user experience on the page. This is the main key for today’s web2.0 search engines.
Here you have some good examples that make our life easy:

Minube - Fly search engine
Shopall
AjaxLookup Domain Whois

If you want to check what I am [...]