Currently, I'm running OpenSolaris 2008-05 within a Virtualbox 1.6 VM on an Ubuntu 8.0.4 64-bit host.

My screen resolution is limited to 1024x768. I'm trying to increase it.

I tried the suggestions on this blog:

http://blogs.sun.com/daner/entry/running_opensolaris_2008_05_under

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If you want a higher res screen, the default in VBox is 1024x768, before starting the VirtualBox guest run:

VBoxManage setextradata "Solaris 10" "CustomVideoMode1" "1280x10240x24"

Where "Solaris 10" is the name of VBox vm and I'd recommend bumping the video memory to at least 64MB. I had to do this for each vm I created.

Note that the xorg.conf that Alan provides on his blog currently causes X to crash on the latest Nevada and OpenSolaris. I'm currently trying to figure out why.
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The name of my VM is "OpenSolarisIndiana". I tried running the following command:

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me@mysystem:~$ VBoxManage setextradata "OpenSolarisIndiana" "CustomVideoMode1" "1280x10240x24"
VirtualBox Command Line Management Interface Version 1.6.0
(C) 2005-2008 Sun Microsystems, Inc.
All rights reserved.

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I also increased my video RAM to 64 Mb.

I tried restarting my VM and VirtualBox several times, and this solution doesn't work.

I googled and searched the forums, but I couldn't find anything.

Any ideas?

install the vb tools, as suggested above. (It's an option in the menu of vb, it will load a virtual cd on the desktop)

Otherwise, before using vb 1.6, after setting the resolution to 1280x10240x24, I had to start xorgconfig, and create a new definition from there. Select the 24 bits screen depth, and save the generated file into /etc/X11/. In the previous link, the guy selected 32 bits, but I can't even find this in xorg...

But the vb tools may be enough to get full screen easily (and the mouse works better, much faster)