One of the many benefits of open source is that it allows people to experiment. In particular, it lets people try out all sorts of whacky ideas that would simply be stifled at birth had they involved closed source. A good example is Portable Firefox, which consists of a slightly-modified version of the free browser such that it can be placed on a USB drive and run from it, without needing any further installation.
I knew that this had spawned things like Portable Thunderbird, which does the same thing for Mozilla's email client, but I hadn't realised that things had gone much further. For there is now a site called PortableApps.com, run by the person behind Portable Firefox, John Haller.
And what a cornucopia of a site it is. In addition to portable versions of Firefox and Thunderbird, you also find "ports" of OpenOffice.org, the IM client GAIM, the Web site editor NVu and the anti-virus program ClamWin. There's even a mini LAMP stack - though this is without the GNU/Linux part. However, the PortableApps site indicates that portable operating systems are on their way.
The software on this site represents quite a significant achievement, because it means that you can literally carry around in your pocket all the main apps that you need on a USB drive. Provided you can find a PC with a USB socket you can start working as if it were your machine.
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