I use GSiteCrawler to build my sitemap.
Each time I add a new page, I just update the sitemap which is super easy to do with the program.
Each time I do that, it gives me the option of pinging the updated sitemap to google.
I always choose yes because i never really update the sitemap more than once a day, often less.
But, is there a limit to how much one should ping?
If I update my sitemap twice a day, should I ping each day or does it in some way annoy google?