Puh, this is really strange: I still see 2 resultsets - and after 7 days I can say that SERPs #1 are shown from right at 0am to about 5am local time and SERPs #2 the rest of the day. I thought this was some kind of dancing around again but it seems to be quite stable now for 1 week.
Funny thing is: SERPs #1 are better then before, SERPs #2 are worse (in rankings of main keywords).
Google is no longer following my robots.txt file. It has indexed hundreds of pages that I have disallowed.
Same here, got a complete set of new pages with robots=noindex in the index.
Generally it's best to make any changes when SERPs are stable, never within an update due to panic!
In general I would agree, but I haven't seen something like "stable SERPs" since January... This makes it quite hard not to panic ;-)
[edited by: tedster at 7:43 pm (utc) on May 13, 2010]