My websites: 101bell.com and teambelt.com both have the ability to do your own searching and include pool as a criteria. As well, searchomes.com (the Realty Executives of Phoenix website) also has the same functionality.
An agent can also set up a search for you, and have the results of new listings in the area you are interested in emailed to you every day. However, for your random, "I wonder what's on the market in Phoenix?" query, my website works quite well.
Steve Belt, GRI