...and it couldn't have come at a better time for me.
I've been hard at work on a large Flex 2 application that utilizes Web Services to communicate with the back-end. I've run into a number of issues that had to be worked around, all of which appear to be fixed by Flex 2.0.1 Hotfix 3.
It looks like Hotfix 3's main focus has been the Web Service classes, adding more stability and fixing lingering issues. This should be a welcome update to anyone who's been banging their head against a wall using Web Services.
One of the issues in particular, using a secure wsdl switches useProxy to true which breaks applications, was quite a pain to deal with. This is where the Open Source Flex announcement really pays dividends. I was able to find the issue in the public facing bugbase and monitor progress. I was happy to see that the issue was already reported, that it already had a valid workaround, and that it was going to be fixed in an upcoming Hotfix 3 release. Kudos to Adobe for having transparency here.
As with any Hotfix release, if you're not experiencing any of the issues that were fixed then it is not recommend that you upgrade. As they say... if it ain't broke...
However, if you're using Web Services you might want to consider the Hotfix 3 upgrade at http://www.adobe.com/go/kb402381.