The results and analysis for Blu-ray (and DVD) sales for the week ending 23rd April 2011 has just been posted. And what is normally a footnote in the analysis, actually changes everything this week as we get HMM's revised figures for "Avatar Week" (the week a year ago in which Avatar was released). It appears Avatar Week still remains the record breaking week in terms of Blu-ray market share, as apparently it had already broken through the 27% barrier, something that has only recently been "repeated". So no records have actually been broken recently, but last week came really close. Harry Potter and the Deathly Hallows: Part 1 again dominated, and the only new release in the Blu-ray top 10, Oscar winner The King's Speech, came third.
DVD sales was up, to almost Avatar levels (only 0.3% down actually), largely thanks to the Easter sales bump which occured later this year (and most holiday sale bumps favour the dominant format, which is still DVD).
You can read the rest of the stats and analysis here.