I may be using the word 'modern' a bit liberally here, but these are all more recent than K&R at least. 'C A Reference Manual' I think is what a lot of people really want out of a C book and 'Expert C'/'C Traps and Pitfalls' both help with all of the less intuitive parts of the language that you don't really get out of K&R.

C A Reference Manual http://www.amazon.com/Reference-Manual-Samuel-P-Harbison/dp/...

Expert C http://www.amazon.com/Expert-Programming-Peter-van-Linden/dp...

C Interfaces and Implementations http://www.amazon.com/Interfaces-Implementations-Techniques-...

C Traps and Pitfalls http://www.amazon.com/C-Traps-Pitfalls-Andrew-Koenig/dp/0201...