History was made with these entertaining and addictive, beautifully designed artefacts...Electronic handheld games.
Gunpei Yokoi, traveling on a bullet train, saw a bored businessman playing with an LCD calculator by pressing the buttons. Yokoi then thought of an idea for a watch that doubled as a miniature game machine for killing time." -Wikipedia
My nostalgia collecting mania was triggered by this book:
Electronic Plastic, 2000. www.handhelden.com
Here you can find some cool G&W emulators (!): www.zophar.net/gw.html,
and this is the most complete handheld database: www.handheldmuseum.com (it's worth its name).
And finally, the blog of a fanatical collector: www.balduin.wordpress.com/category/game-collection.