DOSBox is a great program! I have installed and can play so many of my favorite games again. The ones I currently have installed are:
Mechwarrior 2: 31st Century Combat
Mechwarrior 2: Ghost Bear Legacy
The 7th Guest
The 11th Hour
Warcraft
Warcraft 2 (original Dos version)
Pagan: Ultima 8 (I have the full collection but 8 was my favorite)
Doom
Full Throttle
These were all great games, but without DosBox and making .iso files from the CD's I doubt they would ever run on Windows 7. I installed a Win 95 game called Magic the Gathering: Duels of the Planeswalkers under Windows 7 and it did run, but it ran so fast that it was uncontrollable. Since it was made for Win 95 it wont work under DOSBox so that program is still unusable. Still working on it though, it was too fun of a game to just drop it forever. Funny though, I installed and can run Diablo (Windows 95) just fine.
We are in an era of almost all games going better and better graphics yet the gameplay is seriously lacking. The games above weren't very pretty but the gameplay made them amazing. Funny, 7th Guest was considered to have ground-breaking graphics for its time, its a shame companies don't revisit these games and give them a facelift while preserving the overall gameplay.