JS/Linux
Heads up to those who have not yet heard of the Javascript emulator that does a 486-based VM for running Linux inside your web browser - courtesy of the l33t haxor skills of Fabrice Bellard.
URL: http://bellard.org/jslinux/
Firefox v4 and latest Chrome versions supported.
Fabrice said he did this for "fun". But this raises all kinds of possibilities for support forums like this - where an interactive Linux kernel can be used, in the web browser, as part of an OTN posting, to for example explain scripting concepts, network troubleshooting and so on.