Two more things that I wanted to bookmark:
Peteris Krumins’ “A Unix Utility You Should Know About: Netcat“. Actually, I want to bookmark his entire site, as there’s a lot of good stuff there, including “Low Level Bit Hacks You Absolutely Must Know“.
Also: Michael Ossmann’s HackRF Kickstarter, which is fully funded and has 29 days to go. This is a project I’m really excited about and will probably end up backing. Short version: HackRF is a project to build a software defined radio that is about the size of a USB hard drive, runs off of USB bus power…and if you back the project (and if it ships, this being Kickstarter and all), the cost is around $300, which puts it into “Shut up and take my money” territory.