OkCupid.com
is a totally free matching service. It's also extremely
accurate, as long as (a) you're honest, and (b) you
know what you want. Ok Cupid don't claim to evaluate
you perfectly, but they do claim to find someone who
claims to fulfill your claimed requirements, exactly.
Ok Cupid firmly believe that most matching sites are
just personals services; their "matching"
systems are nonexistent or overly subjective.
While they
have a small team, OkCupid all take math (and all
that math implies) very seriously. OkCupid is a fun
project for for a variety of reasons, only one of
which is the actual content. They aim to be the best
matching service on every front: superior technology,
better math, better psychology. And of course, it's
free, unlike all the others.