Running the steps of the article...

developerWorks Article Demo #1: This pipe simply queries trucks for sale in a given area.

developerWorks Article Demo #2: This pipe describes pinging a del.icio.us subscription based on all user tags on a given topic passing in a searchable term to filter the subscription down. (use "dessert" for the subscription and any term in the search field)

developerWorks Article Demo #3 Part 1: This pipe simply queries craigslist.com providing an input to the search field. While this could easily be done directly from the website storing the RSS feed URL to be used directly in a reader, pulling it into our piping engine allow me to utilize it easily…

developerWorks Article Demo #3 Part 2: This pipe sucks in items posted as "wanted" from craigslist.com and for each item determines the item desired passing that into the pipe from part 1 of this example which determines whether related items have been posted for sale.