I have started a free new service to let people know exactly when Google commence a PR Update or an Index update on Twitter.
Updates will be published the first day changes are noticed, and I am currently tracking changes on over 1K domains, for movements in indexing and PR Updates.
If you're interested in real time information you can follow the newsfeed here:
http://twitter.com/google_update
I will be publishing updates as they occur (a few times a month) when Google roll out changes in their index or do a PR update.
Enjoy.
