What's the story with eHarmony.com?  They don't do gay matches.  Are
they some Christian cult, hoping to get breeders together to
overpopulate the earth?

Thank you for accepting my findings as your answer.

Although eHarmony does not seem to be officially linked to any
Christian group, the site's founder, Neil Clark Warren, has appeared
on several evangelical Christian television programs, and Warren has
had books published by Focus on the Family's publishing house. While I
don't consider Focus on the Family to be a cult, the group is
certainly a prominent proponent of "Christian values," mainly as
interpreted by media minister James Dobson.

I've reposted the link from my comment, plus some extra material.

AlterNet Love Machines
http://www.alternet.org/story/21291/

Daily Kos: eHarmony and Focus on the Family
http://www.dailykos.com/story/2005/2/5/145919/2183

Regarding the relationship between eHarmony and Focus on the Family, I
found this on eHarmony's own website:

"Warren said eHarmony struggled in the beginning until the evangelical
Christian leader James Dobson, founder of Focus on the Family, gave
the company its big boost by hosting Warren on his national radio
broadcast. Warren describes Dobson as eHarmony's biggest supporter,
and the appearance on the show reaped 100,000 subscribers, he said.

Warren, who is open about his Christian faith, said the support of
Focus on the Family the organization also published his best-selling
book, 'Finding the Love of Your Life' has led some critics to think
eHarmony only matches Christians."

eHarmony: Searching for a love connection
http://www.eharmony.com/core/eharmony?cmd=community-searching-love-connection

Google search strategy:

Google Web Search: eharmony gay OR homosexual christian
://www.google.com/search?hl=en&q=eharmony+gay+OR+homosexual+christian

Best,
Pink

Thank you for the stellar answer.  Their commercial certainly got my
hopes up.  I may post a related question.

This article may interest you:

http://www.alternet.org/story/21291/

Interesting story.  If you want to post as an answer, it seems
sufficient to answer the question.  Thanks.

Also:

<a href="http://www.salon.com/mwt/feature/2005/06/10/warren/index_np.html">http://www.salon.com/mwt/feature/2005/06/10/warren/index_np.html</a>

I have found a couple of good reviews of eharmony:

http://www.datingsitenetwork.com/eharmony/
http://www.onlinedatingsource.com/eharmony/

Neither one of them mention the heterosexual exclusivity. Also worth
noting is that eHarmony is going to be offering marriage counseling
soon. Too funny.