DomainKeys - worth it?

[mihomes]

Looking over some new things to make sure email is always received by my customers and found DomainKeys.

What are people thoughts on this? Anyone have any eperience with it? Do you find it worth it or more one of those 'it cant hurt and can only help me' issues?

[pageoneresults]

Here's a related discussion from 2006 April...

EOC - Email Optimization Consultant [webmasterworld.com]