Very interesting! Is there any hope of a 2012 update?
Thanks! I have updated things for 2012, and the end of 2011.
#1 v. #2 finals occured at Australia and at Roland Garros, both Djokovic v. Nadal, while the #3 v. #4 final at Wimbledon was the first since 2003 in London to not feature a top 2 seed.
All top 4 seeds made back-to-back semifinals, at 2011 USO and 2012 AO, in fact this occurred at 3 of the last 4 at that point, stretching to 2011 RG. Both were the first time that had happened.
The 2012 US Open saw the 7th time that 7 top 8 seeds made the quarterfinals, and the first for the USO, making it the last of the slams to reach that milestone.