When I travel with my Mac, I’m continually connecting to different wifi hot spots to check back on the data center and work with any support emails. As you can imagine, doing these two things, I’ve tried to be very careful not to use terribly private passwords and URL’s. You just never know if you can trust the network you’re using.
A couple months ago, I set up an SSH tunnel using these instructions. This allows for me to send all traffic encrypted to my Mac mini in the data center. This keeps things safe.
If you find yourself traveling often, perhaps this will be of use to you as well.