It's a great module with true Parallel execution and great documentation. I especially appreciate the reviews of and links to other Parallel modules. Nice work Ofer!
YAML has worked very well for me on a variety of projects, but most especially the small ones. IMHO, there is no easier interface. In one case I used YAML to create (and recreate from a database) very large glossaries that are loaded with Catalyst as a memory-resident database (which is fabulously fast now). (We still use multiple YAML files on our Catalyst servers instead of the new Catalyst preference.)