Lee Brimelow has just posted some more information in regards to the issues WordPress, Flickr, SWFUpload have with the Flash 10 Beta. Unfortunately, it doesn’t look like the behavior is going to change, but I do understand a bit more on why this was put in place.
Another encouraging thing is that Lee mentions Adobe will be reaching out to Flickr, WordPress, et al, to help them come up with solutions. If you know any other sites / companies, applications that are running into this problem, let Lee know so that Adobe can work with them as well.
One thing I love about Adobe is that they DO listen. You just have to make some noise. 🙂