While there are a few internet dating site specifically dedicated to introducing Jewish singles, I also highly recommend that you check out Big Church, and especiallyeHarmony which does an intensive profile which makes for better matches.
Match.com and Yahoo Personals also offer religious affiliation as one of their search critera and place enough prominence on that criteria to warrant being listed here.
Jewish Mingle - From IMsimcha4u: "We're getting married! Thank you Jewish Mingle. We're both so grateful that we took the chance to explore the possibility of meeting a Jewish partner on the web. We want everyone to know that you can meet a great partner through Jewish Mingle and that dreams can come true! We wish everyone the best of luck, life, and love! Shalom!"
Jewish Matchmaker.com - Matchmaker offers a number of religious communities (including Jewish Yenta Matchmaker) from which to choose. As the oldest, and one of the largest internet dating services, you are almost sure to meet a nice Jewish girl or boy here. :-)
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Related Dating Services
Big Church - Looking for others of the same faith? BigChurch is a community of people building their faith and interacting with others. Every day, hundreds of people get listed so you'll always find new church friends at BigChurch.com!
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eHarmony.com - Matching based on Christian principles. God creates an infinite variety of people... so finding the ones who are right for you can be almost impossibly hard! eharmony can help you find the person who will truly be your "soul mate!" Are you ready to find your soul-mate?