Since I got my Herzog/Kinski boxset on Friday, over the last couple of days I've watched:
Cobra Verde - probably the weakest of the bunch, as it seemed underdeveloped and a bit unfocused. Still quite good, though.
Woyzeck - much better, Kinski was amazing in this.
Nosferatu - which I've seen several times before and love to death.
Also included in the boxset, though I haven't watched them yet, are Aguirre - the Wrath of God, Fitzcarraldo and My Best Fiend. I've seen each before though as both Aguirre and Fitzcarraldo rate among my favourite films (Aguirre in particular, which always makes my top 10). My Best Fiend is very enjoyable as well.