Wireless network access from away

I have a wireless network set up at my home. I have 2 PCs there and I also have a laptop. I would like to know the best way to share files between my laptop and my home PCs when I'm not home. For example I am at friends houses a lot and I would like to be able to use my laptop to share files with the PCs at home from their houses. I have Roadrunner cable internet and a wireless router set up at home with the PCs running wireless pci card and wireless usb adapter. I have them sharing when I'm home, but I would like to be able to do it when I'm away as well. The desktops at home are running XPHome and Vista and my laptop is Vista. My friends also have RR with wireless routers. Thanks in advance for all input.

 

May be this can Help, http://www.ezlan.net/myip.html

There are also service like logmein.com that can do it for you.

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You can try setting up a VPN