is the pingomatic in wordpress enough for my blogs ping needs or are there any other recommended lists of ping services for wordpress blog?
Here's a site that has a good list of URLs you can add to your ping list -
hxxp://pingsites.net
This list is good, since it's frequently updated.
You can try this website: hxxp://autopinger.com/blog.aspx. It pings a list of different pingers instead of just the one that's in WP.