I'm not sure if this is WP 3.0 specific, but I'm using a copy of the 3.0 from the WP.org SVN and Gravity Forms 1.3.8
When I go to my plugins page, I don't see a Gravity Forms "upgrade" notification, but when I go to the GF Settings page it tells me there's a new version (1.3.9) available.
Anyone had similar issues or know how I can help debug further?