A reader wrote to me and asked those very questions; which got me thinking that a few others might be wondering about how often to do Pilates, and how to do it a lot - safely. Let me say that you can definitely do Pilates every day (though you certainly don't have to). The key will be to know how to balance your workouts so that they are not only safe, but progressive and interesting.
Here is an article that will provide some insight on creating a Pilates workout that you can do frequently, and will work for you over time:
Doing Pilates Daily
If you have a question or an idea that you would like to see addressed here at pilates.about.com, you can email me (see above) or you can post in the Pilates Forum (free easy and annonymous) and get a community of experts working on it.
Some open discussion going on in the forum right now include: