VMWare on Ubuntu Hardy
Both the latest VMWare Server 1.0.6 build-91891 and VMWare Workstation 6.0.4 build-93057 install with no trouble on Ubuntu Hardy 8.04. There is one small catch with the vmware-server-console, however. I came across an Ubuntu Forums thread that resolves that issue though. All you have to do is move a few included libraries out of the way and it will start just fine using the OS provided libs.
cd /usr/lib/vmware-server-console/lib/libgcc_s.so.1
sudo mv libgcc_s.so.1 libgcc_s.so.1.org
cd ../libpng12.so.0
sudo mv libpng12.so.0 libpng12.so.0.org