Copyscape will search the web for pages that match the page you submit. What it does is a word comparison to determine if pages appear to be plagiarized from the submitted page. This makes is so easy to see if and who is ripping off your work.

Link:
http://www.copyscape.com/

Check out these posts too:

  1. Create webpages through Google
  2. See the Page Rank of all links in a page
  3. Online website creator with Jimdo
  4. HowTo Get Your Business Listed On Major Local Search Engines
  5. Grab an entire website and browse offline
  6. Test your website in IE6, 7 and 8 with SuperPreview
  7. Webmaster tools from search engines gives valuable information