Remove link to "Talks" page
Document DreamPlug support

DreamPlug requires different commands to flash u-boot and a different
kernel image (due to the DT blob).  Thanks to feedback from Tixy and
Philippe Clérié on the debian-arm list.
Updated NSLU2 tar ball to Debian 6.0.7
Get rid of prompts in code examples

Get rid of Unix prompt in code snippets to make copy&paste easier.
Provide Debian 7 tar ball for NSLU2

Provide a Debian 7 tar ball in addition to the Debian 6 tar ball.  Update
some references to Debian 6/7.