I emulate just about everything pre-N64 on various computers, Xbox, PSP, and cell phones and tablets.
SkummVM is amazing on Tablets or Cell phones. I had a few of my friends' jaws drop when I showed them Loom running on a smart phone. Pretty great stuff. For those older PC games I really enjoy the 'emulation' of them on various systems. For on the road or right before bed, in bed, at night I like the PSP to play a few moments of Blazing Lazers or some other nonsense that is easy to just pick up and play. The Xbox is in our main living room and does a pretty good job of displaying games (Turbo, Genesis, SNES, NES,) in 1080i on an LCD TV (with Options) without many of the issues I've ran into with my actual un-modded hardware.
But, like most others, I prefer to just play the originals.
It's the best way to experience Retro gaming. Some of it that I don't play as often as I'd like, I have packed up, and some I have on display for everyone to see and play. I like to pull out a traditional CRT monitor to play games on as well. I just need more space currently to have retro stuff available at all times.