It's quite common for a site to be referenced by more than one domain name. In fact, most sites are referenced by at least two: a www version and a non-www version. These are usually set up to reference the index page on a site and produce the same results for a searcher.
It could, however, be argued that these are these same domain names. So the question remains: why would someone want to have more than one unique domain name for a single site?
Search engines - First, let's take a brief look at searchengines. In the past, it was a very common spamming technique to purchase dozens, hundreds or in some really gross cases, thousands of domain names, all referencing exactly the same site. These were all submitted to the search engines, and many of them were indexed and blindly added to the results. This is how many questionable sites used to get top search results very quickly and inexpensively.
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