I just want to share this page that lists useful ping sites to help your site traffic. http://www.maranan.us/archives/list-of-ping-services/ Im sure there are a lot more out there but this is a good start for newbies trying to explore ping sites.
I checked your list, there are easily 30+ or 40+ of sites.. Do I need to go to each and everyone whenever I undate my websites? Wouldn't the SE pick up automatically that the websites have been updated by it's republishing?