I am busy working on my Dynamic Legend Widget for ArcGIS Viewer for Flex 2.0 and will submit it to the code gallery when done (most people will have to wait until they deploy ArcGIS Server 10 before they can use it though).
FYI- I probably will not share any of my code changes that I did for my site until the viewer is out of Beta, that way I won't have code out there that will just break once ESRI releases the final version.
Be sure to share you ArcGIS Viewer for Flex 2.0 Site once you get them deployed.:D