The inurl search syntax allows you to search for words within the URL. For example, if I wanted to find all the URL's that contained the word "flower" in Google, I would do this:
You can also do this in Yahoo - inurl:flower. Ask.com supports the inurl syntax, as does AOL Search and Bing. This is just another interesting way to search the Web and find Web sites that you might not have found by just entering in a query word or phrase.