Advanced FPGA Design Concepts

Today, I have learned a new fpga design concept called "Flancter". Clyde introduced this in the VHDL class.

While searching about this on google, I found couple of interesting links:
http://www.doulos.com/knowhow/fpga/fastcounter/

Books related to this topic:
Real Chip Design and Verification using Verilog and VHDL