I have run into a few customer issues that could be traced to them not having successfully upgraded to Flex Builder 2.0.1.
(I believe upgrading from the last GMC to the Final release was supposed to work, but upgrading from earlier GMCs was not.)
Whatever the case, if you need to know what build you are using here are the directions to find it in either the Standalone version of Flex Builder or the Eclipse plugin version:

If using Flex Builder Standalone, if you go to:

Help/Product Details/… and click on Feature Details.
You should see the Flex Builder2 feature version #

If using the Eclipse Plugin, if you go to

Help/About Eclipse SDK/ …and click on Feature Details.
You should see the Flex Builder2 feature version #

For the Flex Builder 2.0.1 release, the version# should be 2.0.155577

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