I'm glad you asked! You can file bugs (or request enhancements) against the Flex SDK, Flash Builder (formerly Flex Builder), and the Flex Documentation at http://bugs.adobe.com/flex/
In fact, you can also file bugs against Flash Player and Blaze and several other products there also.
Let us know if you have any questions.
Flex SDK Team | Adobe Systems Inc.
Thank you for the link. However I'm not seeing a category for "Flash Builder", only references to "FlexBuilder 3", etc. Will you be adding a Flash Builder category or should I use another?
Please advise and thanks,
Yeah, file the bug report against the "Flex Builder" project (unless it is a documentation issue, in which case use the "Flex Documentation" project).