Ping-O-Matic is a new service [1] for weblogs. You can send a standard weblogs.com compatible ping to http://rpc.pingomatic.com/ and they will ping a subset of their services. Currently, this is a fixed subset of seven services:
– Weblogs.com
– Blo.gs
– Technorati
– MyYahoo!
– BlogRolling
– BlogChatter
– PubSub
[1] http://pingomatic.com
