The articles I read - 1: Xcell Journals from Xilinx
I read my first XCell Journal in 1996 when I started working with XC4000 family of devices. It is a wonderful archive of tips on FPGA/CPLD devices. All the past issues since 1988 are archived online here.
http://www.xilinx.com/publications/xcellonline/
Click on "Past Issues" tab to access old issues. Let me know if you find any interesting read.