I installed Ubuntu 10.10 using netbook cd iso and changed default desktop to Gnome environment. Then I noticed I cannot change "Visual Effects" settings and when opening a menu it flashes and things like that. This happens because compiz is not installed default. To install it you can use Synaptic Package Manager from System -> Administration menu or this command will install it:
sudo apt-get install compiz
And at boottime, if you can't see splash screen during boot,
echo "FRAMEBUFFER=y" | sudo tee /etc/initramfs-tools/conf.d/splash
will fix it I think.