Yes. Well, sorta. Build a site that conforms to the guidelines of the ODP. Submit site. Forget about it. Eventually an editor will find their way too it. Either through the queue, or Google... yeah, yeah, may take a few years, but it'll happen.
As Q said, it really depends on what your definition of "easy" is? if it has the factor "quick" in there, then no, there isn't. If it's the amount of effort required to put the process into action, then yes, it's pretty easy - just suggest it to the most appropriate category and then forget it.