Default Linkbacks ping services

In the vbseo Linkbacks ping services, the three default ones are

http://rpc.pingomatic.com
http://rpc.technorati.com/rpc/ping
http://blogsearch.google.com/ping/RPC2

The second one down is now deceased

There is a half decent lift of google ping services though, so people can aim their pings at their target audience

http://blogsearch.google.com/ping/RPC2
http://blogsearch.google.ae/ping/RPC2
http://blogsearch.google.at/ping/RPC2
http://blogsearch.google.be/ping/RPC2
http://blogsearch.google.bg/ping/RPC2
http://blogsearch.google.ca/ping/RPC2
http://blogsearch.google.ch/ping/RPC2
http://blogsearch.google.cl/ping/RPC2
http://blogsearch.google.co.cr/ping/RPC2
http://blogsearch.google.co.hu/ping/RPC2
http://blogsearch.google.co.id/ping/RPC2
http://blogsearch.google.co.il/ping/RPC2
http://blogsearch.google.co.in/ping/RPC2
http://blogsearch.google.co.it/ping/RPC2
http://blogsearch.google.co.jp/ping/RPC2
http://blogsearch.google.co.ma/ping/RPC2
http://blogsearch.google.co.nz/ping/RPC2
http://blogsearch.google.co.th/ping/RPC2
http://blogsearch.google.co.uk/ping/RPC2
http://blogsearch.google.co.uk/pingRPC2
http://blogsearch.google.co.ve/ping/RPC2
http://blogsearch.google.co.sa/ping/RPC2
http://blogsearch.google.com.ar/ping/RPC2
http://blogsearch.google.com.bu/ping/RPC2
http://blogsearch.google.com.br/ping/RP2
http://blogsearch.google.com.co/ping/RP2
http://blogsearch.google.com.do/ping/RP2
http://blogsearch.google.com.mx/ping/RP2
http://blogsearch.google.com.my/ping/RP2
http://blogsearch.google.com.pe/ping/RP2
http://blogsearch.google.com.sa/ping/RP2
http://blogsearch.google.com.sg/ping/RP2
http://blogsearch.google.com.tr/ping/RP2
http://blogsearch.google.com.tw/ping/RP2
http://blogsearch.google.com.ur/ping/RP2
http://blogsearch.google.com.uy/ping/RP2
http://blogsearch.google.com.vn/ping/RP2
http://blogsearch.google.com/ping/RPC2
http://blogsearch.google.de/ping/RPC2
http://blogsearch.google.es/ping/RPC2
http://blogsearch.google.fi/ping/RPC2
http://blogsearch.google.fr/ping/RPC2
http://blogsearch.google.gr/ping/RPC2
http://blogsearch.google.hr/ping/RPC2
http://blogsearch.google.ie/ping/RPC2
http://blogsearch.google.in/ping/RPC2
http://blogsearch.google.it/ping/RPC2
http://blogsearch.google.jp/ping/RPC2
http://blogsearch.google.lt/ping/RPC2
http://blogsearch.google.nl/ping/RPC2
http://blogsearch.google.pl/ping/RPC2
http://blogsearch.google.pt/ping/RPC2
http://blogsearch.google.ro/ping/RPC2
http://blogsearch.google.ru/ping/RPC2
http://blogsearch.google.se/ping/RPC2
http://blogsearch.google.sk/ping/RPC2
http://blogsearch.google.tw/ping/RPC2
http://blogsearch.google.us/ping/RPC2

can I bring ping services of google blog search use with my wordpress blog - Web Search Help

I always get mixed answers, seems like you may need to ping URL's that aren't indexed. People have said that it doesn't matter, I would say that maybe it just makes the whole process look unnatural, which would make GOOG frown upon it.