VirtualBox 3.0.0 Open Source Edition (OSE) will hit RPM Fusion Free repository for Fedora 11 soon unless something breaks horribly. That means now it's the best time to test it!
Apart from rebase to newest, freshest, coolest upstream code, the guest additions for Fedora were reworked (which means they actually should work now). To get them, install the VirtualBox-OSE-guest package in your Fedora 11 Virtual Machine.
For the X11 display resize functionality to work, you need a recent xorg-x11-server-Xorg package, which is currently waiting to be pushed to the testing repository.
The RPM Fusion community had been doing fantastic job reporting issues and providing fixes for the package, so I feel obliged to send a big thank you to them especially to Kevin Pouget, Gabriel Ramirez, Valent Turkovic and Jonathan Dieter (in no particular order). Kudos to the upstream developers as well, especially for fixing the irritiating network-related hang bug very promptly.
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Mail questions, comments and pizza to lkundrak@v3.sk