I think it's time this project had some fresh blood.
I've been co-maintainer for the last 10 months and in that time I've got a D7 alpha release out, but unfortunately other projects (such as Flag module) are now taking up my time, and I am no longer using Data module for my own work.
I can't speak for the other maintainers of Data, but from the stats on the project page they don't seem to have been active for some time.
Therefore, I think we should seek new maintainers who can take this project forward.
If you're interested, please see the Best practices for co-maintaining projects documentation page here: http://drupal.org/node/363367. New co-maintainers should have some familiarity with the module and have submitted patches.