As far as I could tell, there is no data dictionary view that this information.
So I found this using the
all_tab_columns viewSELECT id ,flow_id ,object_id ,locked_by ,locked_on ,lock_comment ,security_group_id FROM apex_040200.wwv_flow_lock_page WHERE 1=1 --AND flow_id = :APP_ID --AND object_id = :APP_PAGE_ID /I used it to add a region (bound to a build option) that displayed a notification in the sidebar to other developers that the page was locked and under construction/change/development.
Scott.
ps - can you find the joke on this post?