Google has had this for a while now. I had noticed that development has been healthy recently. whereas before it was a relatively unnecessary tool, now it's actually useful.
if it's as useful as Google Sitemaps, then I'm happy with today's news. the protocol does look pretty similar (and by pretty similar, I mean the XML structure is virtually identical). I'm guessing porting Google Sitemaps over to this new one will be painless.
Programmers used to batch environments may find it hard to live without giant listings; we would find it hard to use them. -- D.M. Ritchie