Blu-Ray movie sales for 2008 were 4x that of 2007.
More info:
http://www.engadgethd.com/2009/01/08/live-from-the-2009-blu-ray-disc-association-press-conference/
Update:
"It turned out to be a phenomenal year for Blu-ray," said Tom Adams of Adams Media Research. In the fourth quarter of 2008, which is only too important for tech companies, U.S. consumers bought up 28.6 million Blu-ray titles."
http://news.therecord.com/printArticle/469824
http://www.afterdawn.com/news/archive/16575.cfm
http://tech.yahoo.com/news/ap/20090109/ap_on_hi_te/tec_gadget_show_blu_ray
According to Videoscan 22.7 million DVDs were sold for North America in 1999 as a whole.
Older news:
- Blu-Ray bestseller Dark Knight sold 1.7 million units its first week in 2008.
- For comparison Matrix DVD bestseller in 1999 sold 780K units its first week.