Currently reading
David and Goliath: Underdogs, Misfits, and the Art of Battling Giants
The Speed of Dark
Battle Royale
Marianne Dreams
Coming to Our Senses: Healing Ourselves and the World Through Mindfulness
This book was just as good as I remember it from my youth. Some of the best bits involve time dilation, nova bombs, a stasis field and combat within using knives and bows, swords and spears. Rereading as an adult, I found the character story fairly solid as well. There are related stories and even a direct sequel, but I don't consider this book part of a "series".