You can search for newly published patent applications at the U.S. Patent and Trademark Office, but if you want the latest patent applications served to you by RSS syndication and email alerts, you'll need to visit FreshPatents.com. Industry list RSS feeds filtered by USPTO class number are particularly valuable. The content is crawled and indexed by Google as well.
Browse for new patents by industry category or do a keyword search. For example, if you browse USPTO Class 715, Data processing: presentation processing of document patents you'll notice that it has an RSS feed that you can subscribe to for updates. That makes it easy to find new applications such as application #20040221226 "Method and mechanism for processing queries for xml documents using an index" applied for on November 4, 2004 by inventors Wesley Lin, Yasuhiro Matsuda, and Garrett Kaminaga.
Sign-up for free email patent application monitoring service which will send you a weekly email with new applications that match the keywords you select.
This site is one of those rare examples in which even if you subscribe to the feed, you'll want to routinely visit the website. The site provides searches by keyword and provides lists of patent applications by location (state and city), agent and law firm name, city of the agent, and inventor name.