Generally, when you cross the border into another country, you start roaming and pay a lot for it. The only exceptions are some smaller countries are served my the same infrastructure as another neighboring country (I live in Switzerland and don't roam when I go into Liechtenstein). You really don't get much coverage for your money in Europe, not like it is in the US.
In Switzerland, I'd recommend getting a Sunrise "T@keAway" prepaid USB modem and popping out the SIM, trim to size. I think it's about $3 per day of actual use, unlimited 3G. That's actually what I use here in my iPhone, the non-prepaid version is about $50 per month unlimited, and it allows voice calls and text messages as well.
I'm American and I live in Europe, so I got mixed up all the time when I first came here. Now I've taken to writing the month out ("May") or using the international/computer format in most cases (yyyymmdd).
wow, where have you naysayers been for the past 20 years. Whatever Oprah endorses is immediate gold. She is by far the most influential person for American women, and it's people like her that get people elected, authors on the bestseller list and films made or broken. The iPad is going to sell like hotcakes.