Given that Grandma's nowadays are more and more coming from the Tech Age (Apple's first computer was 33 years ago), it's probably becoming less and issue.
On the Linux from Sabayon and DreamLinux knock the socks off of Ubuntu. DreamLinux is approaching plug and play but I've had trouble installing it on a lot of boxes. Saboyan is gorgeous and 4.0 is due out Christmas Day.
