As you can see below, the upgrade to APEX 3.0 on my local instance was successful.
It took me about 56 minutes to have the upgrade running.
(During the upgrade I received an ORA-00257 = problem with archiver - if you've the same error, look at Note:278308.1 in Metalink to solve it)
The first tests were successful... To get pdf printing working, a bit more is necessary, as BI Publisher or an XSL-FO server is necessary. You find the integration steps here.
The new version of APEX 3 on my local machine, exact version Application Express 3.0.0.00.20
The screen after installing APEX 3.0
Thanks APEX-Dev team! This new version is great!