bwnbwn - 7:04 pm on Mar 29, 2011 (gmt 0)
I have found when adding pages to redo my xml sitemap that is dated and add it to google as a new sitemap. This gets the page spidered within minutes. It could be considered as pinging I guess, but this has been working for me for the last several years. If your adding pages daily then your sitemap is changing daily and IMO this is a good thing to be doing anyway.