Penrose and Gurzadyan have an intriguing new paper that claims there are low variance structures in WMAP in the form of concentric circles. They point to this as evidence of a pre-big-bang cosmology such as the one described in Penrose’s new book.
The ides is that these features come from events just prior to the start of the big-bang e.g. where a black hole is in its final throes of decay.
I am not totally convinced by this explanation but if the low variance circles are real and statistically significant then they certainly must be a signal of something. The level of significance is important of course. You may remember that everything up to and including the initials of Stephen Hawking have been found in the microwave background already.