One Click Multiple Blog Services Pingback Tools

Pingomatic - the most popular. Pings several popular services and specialized services. Create a bookmark for each ping url.
Pingoat - Pings a huge collection of 52 blogging services, including special services and non english tracking services. You can easily select all services by selecting the category.
King Ping - Pings multiple services - 18 in all. Easy to check and uncheck boxes. And you can also create a bookmark with your settings.
Blogflux Pinger - Pings 32 services, including several specialized services and language specific services too.
Feedshark - Ping, submit, & promote your blog, feed, or podcast for free to multiple services.
BlogBlip - Just enter the blog url and it will submit to 15 popular blog tracking services.
Ping The Empire - Pings 18 common blog tracking services.
Pingates - pings 37 services including several many Japanese ones
Ping.In - notifies several Blog Search Engines and blog directories, much like pingoat.
Autopinger - will automatically ping your selected blog services. Has a XML-RPC interface too.
Do you know about WordPress Pinging Lists - which help to ping update services smartly.