Just a list of match making sites I know of in no specific order. Share if you know more.
1. http://www.shaadi.com
Very popular among Desis but because it's for different religions, the profile is not very specific for Muslims.
2. http://www.jeevansaathi.com
Similar to shaadi.com but perhaps less well known.
3. http://www.eharmony.com
This site seems unique because they try to match people based on various factors and answers to questions. It has many Muslims on it apparently.
4. http://www.singlemuslim.com
Specifically for Muslims. Free membership for women. Seems to be a really nice site.
5. http://www.muslimintro.com
Completely free for both genders. Has a simple layout.
6. http://www.isnamatrimonials.net/Matrimonial/
Service provided by ISNA.
7. http://www.muslimwedding.org/
8. http://www.muslimmatrimony.com/
9. http://www.qiran.com/
10. http://www.zawaj.com/
11. http://www.themuslimmatrimonial.co.uk/Muslim-Matrimonial/USA/
12. http://www.imuslimmarriage.com/
New site so membership for all is free.
13. http://www.kamranabegevents.com/
14. http://www.halfourdeen.com/
A site by Baba Ali. Planned launch in 2010 so something to look forward to.
15. http://www.baitulnikah.com/
A site where all the information about a member is posted as a video. Interesting idea. What I disliked about the website is the owner never responded to my queries and that tells me they don't have a good service. But it might appeal to others.
There are a few others which I haven't mentioned because I feel they aren't very good sites either because of poor management or just have a bad reputation. If there are sites or services that you know of that have helped you, do mention them.