Ping Updating Services? To add more or Not?

I stumbled across icerocket. Well from there I wondered which sites you guys notify of your blog updates trough pings? Wordpress automatically updates http://rpc.pingomatic.com/ but should I add more?

If so what are the more popular ones?

Yes you can add as much as you want.
There is no need to worry about. You can find about 75 ping services here pingler.com

use feedburner —>simple way and automatic:D:D:D