I think I first met Ivor around 2001, and started collaborating with him on the OpenGuides project shortly after, which was to prove the foundation of a firm friendship.
Ivor always dazzled me with his enthusiasm, and was not only a rich font of ideas but an excellent listener and sounding board for bouncing your thoughts off; we often had long conversations on the phone in which we would hatch new ideas. One of my fondest memories of YAPC::Europe in 2003 is the sunny afternoon I spent sitting with Ivor in a Paris bistro, drinking coffee and getting to know him better.
Rest in peace, Ivor. I'm going to miss you a lot.