Ste Kulov did a great workshop on FPGA and Verilog at my hackerspace recently and has posted the Verilog source code with good comments for his demos:
I’ve heard a lot of positive feedback from the NERP FPGA workshop we did a couple weeks back. There were a few people who asked me to post the Verilog code that went along with the two demos we did. I added comments to the Verilog files in an attempt to clear up a lot of the stuff we cruised through to avoid turning this purely into a Verilog class. The most useful comments will be in the VGA controller module we wrote:vga640x480.v. Anyway, all the required project files to synthesize the logic we wrote are right here: NERP_demo.zip
I was very satifised to walk away from the presentation with a basic understanding of VGA signals and how FPGAs and Verilog work.