In the past 24 hours there have been 14 empty blocks:
BW.com - 3 of their 7 blocks were empty
AntPool - 7 of their 44 blocks were empty
f2pool - 4 of their 31 blocks were empty
Wow, thanks for the summary stats, have no idea where to see daily totals for these empty ones..
shows mining pool daily block counts with empty blocks marked in red.