If you do then you might be interested in protecting the data you send/receive over these public networks. Sometimes you might want to view emails or sensitive data out in public but you might be worried about someone else snooping in on the data you are transmitting, especially over public networks. If you do then there is a free service called Cloak that allows you to set up a secure connection whilst on one of these networks. I've just had a good read up of their website and of a review from a magazine and I'm quite happy to give their free service a try (there are paid options too, see their website for details).
If you want to take a look at what it's all about and read how easy it is to setup and use then visit GetCloak.com.