I have a PS3 hooked up to my downstairs bigscreen, but no BR upstairs either in the rec room or in the bedroom to the TVs there, so I just use AnyDVD to make images of my discs, that way I can stream them to any of my PCs. ~30gb a pop takes up some considerable space, and it's also nice not to worry about my 3-year-old or any of the other kids that my family brings by to worry about scratching up the original discs and then freaking out when Toy Story won't play
I am also really big on keeping drive images for friends and a few clients that seem to be prone to dropping their notebooks or crashing them completely, I can just boot from a usb key with acronis and 15 minutes later have them back up and running. Whether or not they listen to me and keep backups of their important docs is up to them

I keep a rolling backup (backs up only new files and changes to an existing image) of a 750GB boot drive as well, so having more backups is helpful!