The online community of knife collectors, A Knife Family Forged in Steel
I got the Ken Onion Worksharp for Christmas and I love it. There is a learning curve, so I went to Salvation Army and picked up various knives for some spare change to practice on. Once you get used to it, you will love it. I also carry those DMT Credit Card Diamond stone things that someone else pictured above, in my Bug-Out-Get-Home-Zombie-Survival-Bag. They are great.