When you want to ping your newly created XML sitemap to the various search engines, you don't always want to log-in to Google, Yahoo, Bing or Ask to do so, you may just want to let them know of your updated sitemap.xml at your easiest convenience.
Therefore, here are 4 simple URL commands that will do the job for you, copy and paste the URLs into your 'notepad' or whatever editing device you use and change the 'EXAMPLE' for your own website's sitemap address, not forgetting to alter the '.com.' if you've a 'co.uk' site &c.
BING
http://rpc.weblogs.com/pingSiteForm?name=InfraBlog&url=http://www.EXAMPLE.com/sitemap.xml
ASK
http://submissions.ask.com/ping?sitemap=http://www.EXAMPLE.com/sitemap.xml
YAHOO!
http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid=YahooDemo&url=http://www.EXAMPLE.com/sitemap.xml
GOOGLE
http://www.google.com/webmasters/tools/ping?sitemap=http://www.EXAMPLE.com/sitemap.xml
Keeping a copy of the saved sheet means, every time you update your website's sitemap you only have to revisit and copy and paste 4 times or if you're really brave paste it into a Word document and launch them from there - it works!