On my Android phone (yes, I finally got one) I'm playing an old-school JPRG/Legend of Zelda type game and 80's shooter homage.
On the Kindle you can play old-school text adventures.
It seems our more advanced mobile technology is putting old school gaming back in people's hands (mostly literally). Yes, now with the technology of the 21st century you can go back and play games just like you did 30 years ago. I say this without an intense sense of irony because it's actually a trend with multiple factors we progeeks want to keep track of because it's more than retro – it's cultural and technical.