Tips from the article:

• Choose containers that have wide openings -- wide enough for us to be able to get our trowels and hands inside.
• Don't use of cheap plant pots thatdeteriorate with the exposure to UV sunlight. Choose glazed ceramic pots instead -- they're made to endure excessive heat.
• Choose containers that are between 15 and 120 quartz capacity. Plant roots need to have enough area for them to grow wider and the plants to be healthier.
• Use light-colored containers to lessen the heat absorption and prevent uneven root growth.
• Place the pots and plant containers above bricks or blocks to allow proper drainage.
• Plants that are in clay pots should be maintained moist. Clay pots are porous and water can slip through their sides, so water regularly.

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I did a lot of this. I also used glazed pots, which were pretty and more winter-safe, though I suppose that's a New England consideration. 

That's a good consideration I had not thought of, Dawn.

Any other tips for using Terracotta pots?

I used a lot of plastics, too--the self-waterers. Actually, I planted in anything. I love the vertical ideas. I'm really intrigued by the Dervais. http://www.urbanhomestead.org.  I judge this loosely, because you guys can grow anything in California. What you can do w the pots, though is roll them in and out of greenhouses. I saved a ton of herbs for the winter, made a winter pot of carrots, and did potatoes that way, as well as some greens. 

I get the impression in California that pots are more for style than because they're *needed*.

I've never heard of the self-waterers. Will look for those.

Have a look at "wicking beds" and "wicking boxes" when considering self-watering.