Best method for secure Internet ?????

OK,
So I wasn't sure where to put this post, so I figured I would start with the system I am using and go from there.
The Problem:
I am trying to set up a secure method in which I can use Internet services as I make my way from non-secure places throughout the day studying for school. In any given day I might find myself at 3-5 different locations, studying. I often have my computer with me and would like to be able to use it it without the worries of open line surfing.
I have read (not completely understood) the VPN concept and think that it might provide what it is I am looking for.
Before I went spending the money for an aftermarket plan that provides me a VPN, I thought I would look into setting up my own VPN off of my home connection. Although I am not sure if all I need is an internet line (IP Address) - or do I need an actual computer connected to the Internet at home.
I might be completely wrong here in my thoughts of using the VPN, so please provide any thoughts or suggestions.
Brief Recap:
We have a MBP & iBook G4. We would like to be able to use either of them when we are out in public non-secure areas. Is there a way - and if yes, What is the best method to use to make this happen.
Thanx,
-Al-
MBP Mac OS X (10.4.7)

Qanuk,
VPN provides a method of connecting to a home or business network securely. From some remote location, VPN creates a secure "Tunnel" whereby you can join your home network and use network resources. This would allow you to "share" files, printers, etc. between computers not just on your network locally, but across the internet, regardless of where you are connected.
If your intention is not to share your network's resources across the internet, but to "surf" normally, you don't need to use VPN. With normal internet use, you are already as secure as you need to be. It is true that there is a potential for "snooping" inherent in using open wireless networks, but this is only a potential, not a real problem.
The question is, "what will someone else be able to find?" Well, if you send an email, there is a potential that someone could intercept that email and read it. Big deal. There is also the possibility that someone could determine what websites you are visiting. Again, big deal.
In order to do this "snooping," that someone would have spend a great deal of resources and time learning to use the tools necessary to do this snooping, then spend the time using them while you are on the same network. Why would someone do this in order to collect very mundane information from you? It's just not going to happen.
Now, in any cases where you might actually be transmitting data useful to a "snooper," such as the transmission of credit card information, you will undoubtedly be doing so using a secure browser connection. In such cases, a secure connection is made between your browser and the server to which you are connected (your bank's server, the retailer's server, etc.). No snooping is possible in these cases.
As for your computer, itself, you are protected by the best firewall in the industry. No one is going to be able to "hack" your computer while you are connected to the same network, as long as you have your firewall turned on, and especially if you have no running services.
In short, you are already as secure as you need to be; surf away.
Scott

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!http://farm5.static.flickr.com/4084/4996323899_071398b89a.jpg!
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