My A to Z was not the best, nor was it the first. It's difficult to remember now, but I think Garen Ewing was the one who kicked it all off with his Facebook group, the A to Z of Comic Strip Characters:
Others followed, including Neill Cameron's A to Z of Awesomeness:
There was also an A to Z of monsters and an A to Z of robots, as I recall; I'll try to track those down and link to them too.
Whatever good work I created during my project was inspired by the great work that had come before from artists like Garen and Neill, so if you liked my A to Z, go and look at theirs!