First, if you don’t know what pinging has to with blogs, read this.
Google recently added pings to their blog search. Official announcement:
Today we’re launching the Google Blog Search Pinging Service, which is a way for individual bloggers and blog platform providers to inform us of content changes. Blogging providers who syndicate RSS/Atom/XML and want to be included in our Blog Search index can now ping us directly. We’ll continue to monitor other pinging services and will contribute change notifications to the community. Read more at our FAQ.
Once you’ve logged into WP, go to Options > Writing and add this line under “Update Services”:
You can also ping manually here.