JDate is the largest Jewish singles site, but for those interested in swimming in smaller ponds, below is a sampling of some of the other offerings on the web.
www.frumster.com -- A dating service exclusively for Orthodox singles.
www.jmatch.com -- Like JDate, but replying to messages is free. This site prides itself on being a human-based company, and it makes matchmakers available to its members.
www.jswsn.org -- A Web site aimed at Jewish singles with disabilities.
www.mitmazel.com -- Chabad's matchmaking site. Members need a "sponsor" in the form of an Orthodox rabbi or the wife of an Orthodox rabbi who can vouch for them.
www.basherte.com -- Generic Jewish dating site. Users fill out a basic profile (name, age, physical appearance, etc.) and then write a short essay on "About Me."
www.singlejew.com -- Another generic Jewish dating site. Users check off answers on a multiple-choice profile that includes questions like "If I had the talent ... I would choose to be a: 1. Scientist, 2. Philosopher, 3. Musician."
www.eharmony.com -- Not an exclusively Jewish site, but one where users fill out a very long questionnaire, and then the site matches them up based on their personality profiles.