Where can I find ready-to-use virtual machines?
Solution 1:
If you are open to trying a different virtualization software, I recommend http://www.virtualbox.org.
You could also find some great virtual appliances ready for download from http://virtualboximages.com/
Good luck!
Solution 2:
The VMWare Virtual Appliance Marketplace has many pre-built appliances: http://www.vmware.com/appliances/
Solution 3:
There are some in the answers to this question: Pre-installed Linux for Web Developers?
Then there's BitNami offering various ready-to-go VMs for various purposes: http://bitnami.org/
And the VMWare Applicance market