Google has recently announced that the Google Blog Search Pinging Service is now accepting pings from blogs. So, if you want to ensure your latest posts appear in Google’s Blog Search you will want to ping them everytime you make a new post.
There are two ways you can do this.
While Pingomatic already pings a number of services for you, by adding Google’s ping url to the Update Services list you are sure to increase your blogs exposure on the net. For more information on ping lists and a comprehensive list of update services see the WordPress Compressed All Inclusive Ping List.