I just discovered the work of French-born Philippe Weisbecker. His illustrations are both playful and subtly melancholic. The charming simplicity of his work almost masks its ingenuity — a perfect tension.
Weisbecker was born in 1942 and studied interior design in Paris. He moved to New York in 1968 to work in the field of architecture. It wasn't until he was 30 that he decided to become an illustrator. His age proved no barrier to getting such enviable commissions as the New York Times, Time and The New Yorker. Today he works more in the capacity of an artist, showing his work in galleries around the world. You can read more about him here.
My favourite is the nerdy and super-charming animated circuit diagrams for Panasonic. Be sure to watch. It's especially enjoyable if you know a bit of electrical theory.