A new version of FLexUnit has been released as blogged about here.
The biggest improvements on the old version is a really easy to use FlexUnit ant task to run your tests as part of your CI build.
There were a couple of teething problems with the first version that they released.
The first issue was resolved very quickly with a new release within 24 hours or so of the first release.
I managed to get round the second issue by tweaking and re-building the ant task so that it would work on 2003 server. This fix may now be in the trunk build but I haven’t checked.
There is still a bit of an issue with setting up a trusted swf so that the tests can run but I understand there is a fix for this on the way.