Avinash Kaushik has a couple new Podcasts at the Web Analytics Association on measuring Rich Media Applications (Flash, AJAX, etc).  Among the points Avinash makes:

1. Preplanning: Unlike other things for this area you need to do a lot of pre-planning and make sure your code is included in the rich experience before you get started. On web pages we can recover and tag later etc. In this area it is very hard to do so set a lot of time for planning.
2. Integration of data, hyper important because A) you can’t measure in a silo (so you need to know what the differences are in outcomes based on where different segments of people come from or based on offers or what they might have seen before or after the experience) B) you want to know what people “think”, so in our case it is important to integrate into mechanisms such as website surveys.
3. Testing, testing, testing, testing. You are ready for rich experiences, but are your customers ready? I have a great example of this in the podcast above. Failing faster is a awesome recipe for long term success. 

I have been measuring Rich Media and Podcasts and it's a lot of work….. and there's no clean way to do it.  One thing I do notice….stuff is published without much or any testing and then detailed metrics are expected ….not so easy to deliver when there's been little testing.