Sources of FPGA knowledge?

FPGAs!? Now What?
  Free/Open FPGA-from-scratch tutorial from XESS. 140+ pages.
  Pretty great!
  Xilinx WebPack, VHDL, JTAG debug, Spartan.

MIT 6.111 Labkit Manual
  http://www-mtl.mit.edu/Courses/6.111/labkit/

RTL Hardware Design Using VHDL: Coding for Efficiency, Portability, and
Scalability by Pong Chu

Advanced FPGA Design: Architecture, Implementation, and Optimization by Steve
Kilts

FPGA Prototyping By Verilog Examples: Xilinx Spartan-3 Version by Pong Chu

### More:

WikiBooks: Programmable Logic
  http://en.wikibooks.org/wiki/Programmable_Logic

Advanced Digital Design with the Verilog HDL by Michael Ciletti

FPGA-based Implementation of Signal Processing Systems

Understanding Digital Signal Processing