Aka Akihabara Electric Town.
If you are fond of gadgets, electronics and computers—you just can’t miss Akihabara. It is a big district of electronics shops and markets. It is perfectly adapted to tourists: almost in any shop you can pay by credit card, staff usually speaks English, a lot of souvenirs shops etc. However, it is quite difficult to get lunch there, but possible. If you are brave enough, you can try local Japanese restaurant (if, of course, it can be called “restaurant”…) or just go to McDonald’s at Akihabara metro station. Well, there are also several kaiten-zushi places (with sushi plates rolling in front of you) and also Denny’s—Western-type restaurant.
Go for any gadget you’ve ever dreamed about. In Akihabara you’ll definitely find something. Or everything.

This is what our tour guide reffered to as Geek Town... heh... We didn't spend much time here but, It was a really nice place to get electronics, games, books (Manga), and other stuff... Be careful for the occational Adult Shop... There was something that I was told of while I was there, but I didn't have a chance to check it out. It's a roleplay Eating place. They are all dressed up in maid outfits and they say along the lines of, "Welcome home, master" (in Japanese of coarse) when you enter. Pretty busy city wise, and I really wouldn't want to be out there in an allyway at night :\.. My only down about it bu tI had fun! 楽しい!

What was shocking for me while living in Japan was the gap between advanced technology available in shops and everyday life standard devices. I spent almost the whole day wandering around in Akihabara, getting amazed by the level of hi-tech and dicsovering new inventions. All for sale! And then I came back to my small district in Hiroshima, where there was no sign of modern appliances. It's like the difference between modern Shinkansen passing through Hiroshima and old streetcar to get around the city.
Nevertheless, as for shopping in Akihabara, I would suggest choosing less known and cheeper places like Yamada Denki.

Once you leave the subway you have to shield your eyes from the bright lights of japan's version of "Times Square." The people are crazy and alive and full of energetic zest. Watch out for the "tourist-trap gangs" as I call them, they wait outside the subway stop and haggle you for money to buy stuff.

Also be prepared for a stiff neck looking up at the buildings all the time. Remember, in japan there isn't much space on the island, but plenty of space in the sky.

Akihabara aka the electronic town, is one of the best experiences I've lived. Me, a geek, lover of electronics, been there, surrounded by tons of electronic stuff is like heaven. You can walk for I don't know how many time just in an electronic experience. From Apple store, to Yodabashi, the biggest electronic shop in the world. Or walk into the tiny corridors looking for some unfoundable hardware you just can find there. Akihabara to geeks is like Meca to muslims!