Better Installer/Updater on Windows
Java is suffering for years now because of deployment Problems on the Windows platform.
To sum it up:
* Support for "real" updates. No more side-by-side installing even of update versions (users don't like to _waste_ hundreds of megabytes for u4, u6, u8, u11, ...).
* Support for diff-updates. Only transmit der parts that changed (don't know wether this is implemented already)
* More solid applet/webstart support. These two functionalities still cause many problems :-/