After looking at using icons for stat blocks last week, I decided to see how they'd work with another idea I've done some experimenting with in the past: CCG style cards for monsters.
This is the Scarecrow from the AD&D Fiend Folio, converted for use with B/X D&D (my system of choice). Instead of rolling for wandering monsters you could have a deck of cards that you could draw a new monster encounter from.
The layout is based on the old White Wolf CCG RAGE! and I'm still experimenting with the best way to fit the required info into the limited space. I definitely like that most of the card is taken up with artwork.