I have just started working with Crossover/Flash MX. First things first, initial impressions are that it works reasonably well.
I have just recompiled a largish project that was developed on Windows 2000 and it appears to all compile (16movies) with no errors. The compiled swf's all appear to work as expected and the resulting site is fully functional. It is quite an involved project as it reads XML files and communicates (read and write) with mySQL via PHP. There appear to be no issues at this stage.
As compilation works I shall now move on to developing a new project and see how the GUI behaves.
I'll let you know how I get on.....