I don't think Google Beta is related to this. Also this post is almost a dupe:
http://blogoscoped.com/archive/2007-03-23-n90.html ,
although there are some changes here.

Wow... I like the interface.

I would love my Google results pages to look like that.

I got that once a few weeks ago. Didn't get a screenshot, since I refreshed too fast, though. :(

I have to say that it's my favorite new search design that I've seen. Clean, clear, and easy to use.

Would't it be good if you, under iGoogle, could select what layout you want your search results to be like, wheather it be Green bars, classic, top left, whatever.

I got it again today around 11am UK time, not sure it there is a specific time frame for when it's available? Guess will check again tomorrow!