Rental kiosks, digital streaming capture movie-rental market share from brick-and-mortar stores, finds The NPD Group.

U.S. consumer rental of movies in DVD and Blu-ray Disc formats fell by 11 percent in 2011 compared with the prior year, while consumers tapping VOD options account for a third of all movie rentals, according to new data from The NPD Group.

The leader in physical-disc rentals was Redbox, whose unit volume increased by 29 percent year over year. As a result, Redboxas share of DVD and Blu-ray movie rentals rose from 25 percent in 2010 to 37 percent in 2011.

NPDas VideoWatch consumer tracker indicates that much of the share gains came from traditional brick-and-mortar retailers such as Blockbuster, whose share fell 6 percentage points to 17 percent in 2011. Netflixas …