No problem, even without vCloud Director you can deploy Templates in vCenter. There are even ready-to-use workflows in the vCO Library for that.
Some other links:
http://www.vcoteam.info/development/how-to-deploy-vms-form-template-in-orchestrator.html
http://communities.vmware.com/message/1733734#1733734
Also make sure you watch the free vCO videos on www.vmwarelearning.com!
Cheers,
Joerg