I recently installed an OS on a USB flash drive, and it works pretty well. I used the standard installation procedure without any tricks, and the installer even asked if I wanted to encrypt my home directory. Now I have a USB stick I can put in just about any computer, and it'll just boot up with my OS installs the required drivers on the go. I'm pretty sure this is next to impossible with Windows and OS X systems, which lead me thinking, that what other things are there that you can do only with Linux*?

I think that SSH-connections are also quite magical. They are easily routed through firewalls, secure, and you can do pretty much anything through a tunnel. After battling many days and nights with Windows VPN, I'd choose SSH over it any time I know you can get a SSH server in windows too, but it isn't nearly as easy and convenient as in Linux.

I know that here lurk people wise in the ways of the Linux. What else can you think of?

*with Linux I mean all Linux based distributions, not the kernel. Go pick your nit somewhere else