IPv6

The end of the year is time for some balance.
Even though I'm no network admin, knowledge of IP networking is the single most used technical skill in my day-to-day activities.
So, good will for the next year:

The most influential book from my bookshelf

The UNIX Programming Environment, by Brian Kerningham & Rob Pike.

This is the only book from school I still read from time to time.
It wasn't even a mandatory one: just a suggested reading for the computer science lab back in '89.
The title is somewhat misleading: it's not about programming as much as about philosophy.
I can actually say that this book has somewhat shaped my way of thinking.
It's worth reading even for people that doesn't work on unix machines: the Bladelogic Network Shell is based on these concepts as well.