Yeah - this really belongs in "Gadgets, Gear and Phones."
I just got back from Europe, and where there is Wi-Fi, you can purchase pre-paid subscriptions for specific time periods. T-Mobile rules in Germany. In Portugal, I used a Swiss company. In Asia, similar options exist - probably cheaper.
I have managed to stay in contact through public hotspots such as Internet Cafes, etc. In such cases, pay cash - don't use a credit card. That can be risky.