On the PHP::Impact blog today Federico points out a few HTML DOM parsers that work similar to jQuery:
Check out a previous tutorial of his for more information on using DOM parsers to scrape information from remote sites.
NETTUTS.com: Building a jQuery-Powered Tag-Cloud
O'Reilly: Migrating Web-Based PHP Applications to Ajax
SitePoint PHP Blog: J4P5 - Javascript For PHP5
Job Posting: Syneron Seeks Webmaster with PHP Skills (Irvine, CA)
Michelangelo van Dam's Blog: Book review: CMS Design Using PHP and JQuery