This is the first version of TubePress that is backed by the GData API. What does that mean for you?
There’s also tons of enhancements and a few bug fixes reported from previous versions.
I’ve also decided to change the organization of the site. Tubepress.org will remain the plugin’s main home, but the documentation, discussion forums, and development area (downloads and tickets) will move to groups.google.com and tubepress.googlecode.com. The existing forums will stay up as read-only and are available here.
Lastly, and this is important, this will be the last version of TubePress that supports PHP4. The plugin is getting quite complex and PHP4′s OOP model isn’t nearly strong enough to keep it manageable and robust.
Give 1.5.5 a try and please report any bugs that you find!