The Power Score, a great blog that could use some more attention has been doing some great D&D monster guides.
In these Sean has been taking various monsters and looking at their growth and changes across as many editions of D&D he can as well as supplementary products.
So far he has covered:
Plenty of art and comparisons between the editions.
The thing I like is he treating the editions as evolving understanding of the monsters.
So pop over and check these out. A leave a comment or two. That's the neighborly thing to do really.