The latest updates, changes and additions to The Authoritative Blu-ray Disc (BD) FAQ:

July 16, 2010

Update: 4.2 What BD formats are available? (added BDXL)
Update: 9.1 What capacities of BD discs are available? (updated BDXL)
Update: 9.2 How much information can actually be stored on a BD disc? (updated BDXL)
Update: 9.3 How far might BD disc capacity increase in the future? (updated BDXL)