Originally Posted by
PizzaSHARK
I love the Instrumentalities series, it's fun seeing a reinvented medieval Europe.
His sci fi is pretty good. Start with the Starfishers series; the first book is a bit byzantine like most of his stuff, but it really hits its stride in the second book and I couldn't put the third book down. Then pick up Passage at Arms, which is probably the best sci fi book I've ever read and is tangentially related to the Starfishers series.
The Dragon Never Sleeps is another good space opera book. I don't think it has anything to do with his other sci fi, though, it's a stand-alone.
Darkwar is probably his best book. The sheer scope of the plot is crazy.