web services ? how can i implement ?

Hello.

I have a brief that states:

" additionally, you can include the results of using a web service somewhere on the page. Examples of web services are available from www.amazon.com and sites like www.xmethods.com "

i have searched on webservices and checked his sources, but im finding it hard to understand how to implement.

Do they give you a link to include?
Could someone ellaborate, or think of an example that i could use with my site? (http://cars.uk-graffiti.co.uk/login.php)

many thanks