MAD #1 is free as a Kindle e-book

My friend Jon Lebkowsky (an editor at bOING bOING and the co-founder of Fringe Ware) says, "Your Popeye post sent me to Amazon, where I discovered you can acquire old original issues of Mad Magazine (and various other comics, including Batman #1 and Superman #1) for the Kindle. Best of all, Mad #1 is free!" (It's also free on Comixology)