I found some threads though Search that discuss Palo tipping
http://www.disboards.com/showthread.php?t=663759&referrerid=&highlight=palo+tip
http://www.disboards.com/showthread.php?t=703812&referrerid=&highlight=palo+tip
http://www.disboards.com/showthread.php?t=639258&referrerid=&highlight=palo+tip
http://www.disboards.com/showthread.php?t=1162459&referrerid=&highlight=palo+tip
here's also a passporter page on tipping
http://www.passporter.com/articles/tipping.htm
http://www.disboards.com/showthread.php?t=663759&referrerid=&highlight=palo+tip
http://www.disboards.com/showthread.php?t=703812&referrerid=&highlight=palo+tip
http://www.disboards.com/showthread.php?t=639258&referrerid=&highlight=palo+tip
http://www.disboards.com/showthread.php?t=1162459&referrerid=&highlight=palo+tip
here's also a passporter page on tipping
http://www.passporter.com/articles/tipping.htm