In addition to the relationships that I know have worked out where folks met on sites such as Mudcat, I have a few good friends who eventually found compatible mates on web dating sites like eHarmony and Match.com, or from personal ads. From what friends and clients have shared regarding using the personals and on-line dating sites, it takes a strong desire to keep at it and withstand rejection, and also a pretty clear idea of what you are looking for in a person and a relationship.