There's a blog post up on Dave Winer's Scripting News today that suggests Google is playing dirty with RSS in a new real-time indexing feature that may use PubSubHubbub (PuSH).
This post appears to be based on the mistaken notion that PuSH doesn't work with RSS.
More info on my blog:
Your help getting the word out would be appreciated. There's some misinformation out there that makes some people believe PuSH is for Atom publishers and RSSCloud is for RSS. That's not the case at all.