Intermediate Robot Building by David Cook covers all aspects of robot building, from mechanical, to electronics, to microcontroller selection
123 PIC Microcontroller Experiments for the Evil Genius is a excellent starting resource for anyone interested in the PIC Microcontroller.
Making PIC-based Laboratory Instruments and Controllers by Harprit Singh Sandhu is hands on tutorial and resource book that teaches you how to build your own interfaces.
Running motors with PIC microcontrollers is a hands on tutorial on running all sorts of small motors with PICBasic and PIC Microcontrollers.
Microcontrol'n Apps is an intermediate book on PICmicros.
Time'n & Count'n is an intermediate level book for PICmicro users that focuses on timers and counters.
The PIC Microcontroller Projects book features 12 complete PICmicro projects in easy to understand BASIC.