When I first started my days of International travel, I bought a kit that contained plug adapters that would work in every country. Nice idea, but it takes up a ton of space. And like I discovered with my trip to Finland last year, even when I know what adapter to bring, I never have enough adapters. I ended up buying a phone charger in Finland to solve my problem.

While it doesn't solve the "not enough adapters" problem, this Universal Power Adapter available at Think Geek does solve the problem of which adapter(s) to bring. The Universal power adapter supports all major plug types. It's a little big, but it's perfect for the traveler who has no idea what country they're going to be in tomorrow.

One warning about this adapter: the devices you plug into it must have a universal power supply, i.e. support 110V and 220V. Most devices do these days, but double check before you blow something up in a foreign country.